diff --git a/bower.json b/bower.json
index 36ef89872..1598e3774 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "pdfjs-dist",
-  "version": "1.5.272",
+  "version": "1.5.274",
   "main": [
     "build/pdf.js",
     "build/pdf.worker.js"
diff --git a/build/pdf.combined.js b/build/pdf.combined.js
index c4c0acc65..985ade58f 100644
--- a/build/pdf.combined.js
+++ b/build/pdf.combined.js
@@ -28,8 +28,8 @@ factory((root.pdfjsDistBuildPdfCombined = {}));
   // Use strict in our context only - users might not want it
   'use strict';
 
-var pdfjsVersion = '1.5.272';
-var pdfjsBuild = '47b929b';
+var pdfjsVersion = '1.5.274';
+var pdfjsBuild = 'c55541f';
 
   var pdfjsFilePath =
     typeof document !== 'undefined' && document.currentScript ?
@@ -48513,28 +48513,49 @@ var Annotation = (function AnnotationClosure() {
   }
 
   Annotation.prototype = {
+    /**
+     * @private
+     */
+    _hasFlag: function Annotation_hasFlag(flags, flag) {
+      return !!(flags & flag);
+    },
+
+    /**
+     * @private
+     */
+    _isViewable: function Annotation_isViewable(flags) {
+      return !this._hasFlag(flags, AnnotationFlag.INVISIBLE) &&
+             !this._hasFlag(flags, AnnotationFlag.HIDDEN) &&
+             !this._hasFlag(flags, AnnotationFlag.NOVIEW);
+    },
+
+    /**
+     * @private
+     */
+    _isPrintable: function AnnotationFlag_isPrintable(flags) {
+      return this._hasFlag(flags, AnnotationFlag.PRINT) &&
+             !this._hasFlag(flags, AnnotationFlag.INVISIBLE) &&
+             !this._hasFlag(flags, AnnotationFlag.HIDDEN);
+    },
+
     /**
      * @return {boolean}
      */
     get viewable() {
-      if (this.flags) {
-        return !this.hasFlag(AnnotationFlag.INVISIBLE) &&
-               !this.hasFlag(AnnotationFlag.HIDDEN) &&
-               !this.hasFlag(AnnotationFlag.NOVIEW);
+      if (this.flags === 0) {
+        return true;
       }
-      return true;
+      return this._isViewable(this.flags);
     },
 
     /**
      * @return {boolean}
      */
     get printable() {
-      if (this.flags) {
-        return this.hasFlag(AnnotationFlag.PRINT) &&
-               !this.hasFlag(AnnotationFlag.INVISIBLE) &&
-               !this.hasFlag(AnnotationFlag.HIDDEN);
+      if (this.flags === 0) {
+        return false;
       }
-      return false;
+      return this._isPrintable(this.flags);
     },
 
     /**
@@ -48547,11 +48568,7 @@ var Annotation = (function AnnotationClosure() {
      * @see {@link shared/util.js}
      */
     setFlags: function Annotation_setFlags(flags) {
-      if (isInt(flags)) {
-        this.flags = flags;
-      } else {
-        this.flags = 0;
-      }
+      this.flags = (isInt(flags) && flags > 0) ? flags : 0;
     },
 
     /**
@@ -48565,10 +48582,7 @@ var Annotation = (function AnnotationClosure() {
      * @see {@link shared/util.js}
      */
     hasFlag: function Annotation_hasFlag(flag) {
-      if (this.flags) {
-        return (this.flags & flag) > 0;
-      }
-      return false;
+      return this._hasFlag(this.flags, flag);
     },
 
     /**
@@ -49146,6 +49160,16 @@ var PopupAnnotation = (function PopupAnnotationClosure() {
       this.setColor(parentItem.getArray('C'));
       this.data.color = this.color;
     }
+
+    // If the Popup annotation is not viewable, but the parent annotation is,
+    // that is most likely a bug. Fallback to inherit the flags from the parent
+    // annotation (this is consistent with the behaviour in Adobe Reader).
+    if (!this.viewable) {
+      var parentFlags = parentItem.get('F');
+      if (this._isViewable(parentFlags)) {
+        this.setFlags(parentFlags);
+      }
+    }
   }
 
   Util.inherit(PopupAnnotation, Annotation, {});
diff --git a/build/pdf.js b/build/pdf.js
index 9f0fa31de..4230b2276 100644
--- a/build/pdf.js
+++ b/build/pdf.js
@@ -28,8 +28,8 @@ factory((root.pdfjsDistBuildPdf = {}));
   // Use strict in our context only - users might not want it
   'use strict';
 
-var pdfjsVersion = '1.5.272';
-var pdfjsBuild = '47b929b';
+var pdfjsVersion = '1.5.274';
+var pdfjsBuild = 'c55541f';
 
   var pdfjsFilePath =
     typeof document !== 'undefined' && document.currentScript ?
diff --git a/build/pdf.worker.js b/build/pdf.worker.js
index f45433b58..587d8c303 100644
--- a/build/pdf.worker.js
+++ b/build/pdf.worker.js
@@ -28,8 +28,8 @@ factory((root.pdfjsDistBuildPdfWorker = {}));
   // Use strict in our context only - users might not want it
   'use strict';
 
-var pdfjsVersion = '1.5.272';
-var pdfjsBuild = '47b929b';
+var pdfjsVersion = '1.5.274';
+var pdfjsBuild = 'c55541f';
 
   var pdfjsFilePath =
     typeof document !== 'undefined' && document.currentScript ?
@@ -40172,28 +40172,49 @@ var Annotation = (function AnnotationClosure() {
   }
 
   Annotation.prototype = {
+    /**
+     * @private
+     */
+    _hasFlag: function Annotation_hasFlag(flags, flag) {
+      return !!(flags & flag);
+    },
+
+    /**
+     * @private
+     */
+    _isViewable: function Annotation_isViewable(flags) {
+      return !this._hasFlag(flags, AnnotationFlag.INVISIBLE) &&
+             !this._hasFlag(flags, AnnotationFlag.HIDDEN) &&
+             !this._hasFlag(flags, AnnotationFlag.NOVIEW);
+    },
+
+    /**
+     * @private
+     */
+    _isPrintable: function AnnotationFlag_isPrintable(flags) {
+      return this._hasFlag(flags, AnnotationFlag.PRINT) &&
+             !this._hasFlag(flags, AnnotationFlag.INVISIBLE) &&
+             !this._hasFlag(flags, AnnotationFlag.HIDDEN);
+    },
+
     /**
      * @return {boolean}
      */
     get viewable() {
-      if (this.flags) {
-        return !this.hasFlag(AnnotationFlag.INVISIBLE) &&
-               !this.hasFlag(AnnotationFlag.HIDDEN) &&
-               !this.hasFlag(AnnotationFlag.NOVIEW);
+      if (this.flags === 0) {
+        return true;
       }
-      return true;
+      return this._isViewable(this.flags);
     },
 
     /**
      * @return {boolean}
      */
     get printable() {
-      if (this.flags) {
-        return this.hasFlag(AnnotationFlag.PRINT) &&
-               !this.hasFlag(AnnotationFlag.INVISIBLE) &&
-               !this.hasFlag(AnnotationFlag.HIDDEN);
+      if (this.flags === 0) {
+        return false;
       }
-      return false;
+      return this._isPrintable(this.flags);
     },
 
     /**
@@ -40206,11 +40227,7 @@ var Annotation = (function AnnotationClosure() {
      * @see {@link shared/util.js}
      */
     setFlags: function Annotation_setFlags(flags) {
-      if (isInt(flags)) {
-        this.flags = flags;
-      } else {
-        this.flags = 0;
-      }
+      this.flags = (isInt(flags) && flags > 0) ? flags : 0;
     },
 
     /**
@@ -40224,10 +40241,7 @@ var Annotation = (function AnnotationClosure() {
      * @see {@link shared/util.js}
      */
     hasFlag: function Annotation_hasFlag(flag) {
-      if (this.flags) {
-        return (this.flags & flag) > 0;
-      }
-      return false;
+      return this._hasFlag(this.flags, flag);
     },
 
     /**
@@ -40805,6 +40819,16 @@ var PopupAnnotation = (function PopupAnnotationClosure() {
       this.setColor(parentItem.getArray('C'));
       this.data.color = this.color;
     }
+
+    // If the Popup annotation is not viewable, but the parent annotation is,
+    // that is most likely a bug. Fallback to inherit the flags from the parent
+    // annotation (this is consistent with the behaviour in Adobe Reader).
+    if (!this.viewable) {
+      var parentFlags = parentItem.get('F');
+      if (this._isViewable(parentFlags)) {
+        this.setFlags(parentFlags);
+      }
+    }
   }
 
   Util.inherit(PopupAnnotation, Annotation, {});
diff --git a/package.json b/package.json
index 39a8032aa..134ab0f5e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pdfjs-dist",
-  "version": "1.5.272",
+  "version": "1.5.274",
   "main": "build/pdf.js",
   "description": "Generic build of Mozilla's PDF.js library.",
   "keywords": [