diff --git a/bower.json b/bower.json
index 68a05b41a..cd89398ac 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "pdfjs-dist",
-  "version": "1.1.86",
+  "version": "1.1.89",
   "main": [
     "build/pdf.js",
     "build/pdf.worker.js"
diff --git a/build/pdf.combined.js b/build/pdf.combined.js
index 33fdcb24b..4faa145e8 100644
--- a/build/pdf.combined.js
+++ b/build/pdf.combined.js
@@ -22,8 +22,8 @@ if (typeof PDFJS === 'undefined') {
   (typeof window !== 'undefined' ? window : this).PDFJS = {};
 }
 
-PDFJS.version = '1.1.86';
-PDFJS.build = '2bbe872';
+PDFJS.version = '1.1.89';
+PDFJS.build = 'dfecfca';
 
 (function pdfjsWrapper() {
   // Use strict in our context only - users might not want it
@@ -18208,7 +18208,11 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
         return new ToUnicodeMap(cmap.getMap());
       } else if (isStream(cmapObj)) {
         cmap = CMapFactory.create(cmapObj,
-          { url: PDFJS.cMapUrl, packed: PDFJS.cMapPacked }, null).getMap();
+          { url: PDFJS.cMapUrl, packed: PDFJS.cMapPacked }, null);
+        if (cmap instanceof IdentityCMap) {
+          return new IdentityToUnicodeMap(0, 0xFFFF);
+        }
+        cmap = cmap.getMap();
         // Convert UTF-16BE
         // NOTE: cmap can be a sparse array, so use forEach instead of for(;;)
         // to iterate over all keys.
@@ -19703,6 +19707,7 @@ var CMap = (function CMapClosure() {
     // - bf chars are variable-length byte sequences, stored as strings, with
     //   one byte per character.
     this._map = [];
+    this.name = '';
     this.vertical = false;
     this.useCMap = null;
     this.builtInCMap = builtInCMap;
@@ -19802,13 +19807,28 @@ var CMap = (function CMapClosure() {
       }
       out.charcode = 0;
       out.length = 1;
+    },
+
+    get isIdentityCMap() {
+      if (!(this.name === 'Identity-H' || this.name === 'Identity-V')) {
+        return false;
+      }
+      if (this._map.length !== 0x10000) {
+        return false;
+      }
+      for (var i = 0; i < 0x10000; i++) {
+        if (this._map[i] !== i) {
+          return false;
+        }
+      }
+      return true;
     }
   };
   return CMap;
 })();
 
 // A special case of CMap, where the _map array implicitly has a length of
-// 65535 and each element is equal to its index.
+// 65536 and each element is equal to its index.
 var IdentityCMap = (function IdentityCMapClosure() {
   function IdentityCMap(vertical, n) {
     CMap.call(this);
@@ -19863,7 +19883,11 @@ var IdentityCMap = (function IdentityCMapClosure() {
       return map;
     },
 
-    readCharCode: CMap.prototype.readCharCode
+    readCharCode: CMap.prototype.readCharCode,
+
+    get isIdentityCMap() {
+      error('should not access .isIdentityCMap');
+    }
   };
 
   return IdentityCMap;
@@ -20328,6 +20352,13 @@ var CMapFactory = (function CMapFactoryClosure() {
     }
   }
 
+  function parseCMapName(cMap, lexer) {
+    var obj = lexer.getObj();
+    if (isName(obj) && isString(obj.name)) {
+      cMap.name = obj.name;
+    }
+  }
+
   function parseCMap(cMap, lexer, builtInCMapParams, useCMap) {
     var previous;
     var embededUseCMap;
@@ -20338,6 +20369,8 @@ var CMapFactory = (function CMapFactoryClosure() {
       } else if (isName(obj)) {
         if (obj.name === 'WMode') {
           parseWMode(cMap, lexer);
+        } else if (obj.name === 'CMapName') {
+          parseCMapName(cMap, lexer);
         }
         previous = obj;
       } else if (isCmd(obj)) {
@@ -20447,6 +20480,9 @@ var CMapFactory = (function CMapFactoryClosure() {
         } catch (e) {
           warn('Invalid CMap data. ' + e);
         }
+        if (cMap.isIdentityCMap) {
+          return createBuiltInCMap(cMap.name, builtInCMapParams);
+        }
         return cMap;
       }
       error('Encoding required.');
diff --git a/build/pdf.js b/build/pdf.js
index a9431eb7d..7301c155e 100644
--- a/build/pdf.js
+++ b/build/pdf.js
@@ -22,8 +22,8 @@ if (typeof PDFJS === 'undefined') {
   (typeof window !== 'undefined' ? window : this).PDFJS = {};
 }
 
-PDFJS.version = '1.1.86';
-PDFJS.build = '2bbe872';
+PDFJS.version = '1.1.89';
+PDFJS.build = 'dfecfca';
 
 (function pdfjsWrapper() {
   // Use strict in our context only - users might not want it
diff --git a/build/pdf.worker.js b/build/pdf.worker.js
index 85f34297d..5666b1f14 100644
--- a/build/pdf.worker.js
+++ b/build/pdf.worker.js
@@ -22,8 +22,8 @@ if (typeof PDFJS === 'undefined') {
   (typeof window !== 'undefined' ? window : this).PDFJS = {};
 }
 
-PDFJS.version = '1.1.86';
-PDFJS.build = '2bbe872';
+PDFJS.version = '1.1.89';
+PDFJS.build = 'dfecfca';
 
 (function pdfjsWrapper() {
   // Use strict in our context only - users might not want it
@@ -11860,7 +11860,11 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
         return new ToUnicodeMap(cmap.getMap());
       } else if (isStream(cmapObj)) {
         cmap = CMapFactory.create(cmapObj,
-          { url: PDFJS.cMapUrl, packed: PDFJS.cMapPacked }, null).getMap();
+          { url: PDFJS.cMapUrl, packed: PDFJS.cMapPacked }, null);
+        if (cmap instanceof IdentityCMap) {
+          return new IdentityToUnicodeMap(0, 0xFFFF);
+        }
+        cmap = cmap.getMap();
         // Convert UTF-16BE
         // NOTE: cmap can be a sparse array, so use forEach instead of for(;;)
         // to iterate over all keys.
@@ -13355,6 +13359,7 @@ var CMap = (function CMapClosure() {
     // - bf chars are variable-length byte sequences, stored as strings, with
     //   one byte per character.
     this._map = [];
+    this.name = '';
     this.vertical = false;
     this.useCMap = null;
     this.builtInCMap = builtInCMap;
@@ -13454,13 +13459,28 @@ var CMap = (function CMapClosure() {
       }
       out.charcode = 0;
       out.length = 1;
+    },
+
+    get isIdentityCMap() {
+      if (!(this.name === 'Identity-H' || this.name === 'Identity-V')) {
+        return false;
+      }
+      if (this._map.length !== 0x10000) {
+        return false;
+      }
+      for (var i = 0; i < 0x10000; i++) {
+        if (this._map[i] !== i) {
+          return false;
+        }
+      }
+      return true;
     }
   };
   return CMap;
 })();
 
 // A special case of CMap, where the _map array implicitly has a length of
-// 65535 and each element is equal to its index.
+// 65536 and each element is equal to its index.
 var IdentityCMap = (function IdentityCMapClosure() {
   function IdentityCMap(vertical, n) {
     CMap.call(this);
@@ -13515,7 +13535,11 @@ var IdentityCMap = (function IdentityCMapClosure() {
       return map;
     },
 
-    readCharCode: CMap.prototype.readCharCode
+    readCharCode: CMap.prototype.readCharCode,
+
+    get isIdentityCMap() {
+      error('should not access .isIdentityCMap');
+    }
   };
 
   return IdentityCMap;
@@ -13980,6 +14004,13 @@ var CMapFactory = (function CMapFactoryClosure() {
     }
   }
 
+  function parseCMapName(cMap, lexer) {
+    var obj = lexer.getObj();
+    if (isName(obj) && isString(obj.name)) {
+      cMap.name = obj.name;
+    }
+  }
+
   function parseCMap(cMap, lexer, builtInCMapParams, useCMap) {
     var previous;
     var embededUseCMap;
@@ -13990,6 +14021,8 @@ var CMapFactory = (function CMapFactoryClosure() {
       } else if (isName(obj)) {
         if (obj.name === 'WMode') {
           parseWMode(cMap, lexer);
+        } else if (obj.name === 'CMapName') {
+          parseCMapName(cMap, lexer);
         }
         previous = obj;
       } else if (isCmd(obj)) {
@@ -14099,6 +14132,9 @@ var CMapFactory = (function CMapFactoryClosure() {
         } catch (e) {
           warn('Invalid CMap data. ' + e);
         }
+        if (cMap.isIdentityCMap) {
+          return createBuiltInCMap(cMap.name, builtInCMapParams);
+        }
         return cMap;
       }
       error('Encoding required.');
diff --git a/package.json b/package.json
index 68027b8cd..40cbf9689 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pdfjs-dist",
-  "version": "1.1.86",
+  "version": "1.1.89",
   "description": "Generic build of Mozilla's PDF.js library.",
   "keywords": [
     "Mozilla",