Use |toUnicode| when creating the glyph map for standard CIDFontType2 fonts without embedded font file

src/core/fonts.js

@@ -2475,6 +2475,12 @@ var Font = (function FontClosure() {
         for (var code in GlyphMapForStandardFonts) {
           map[+code] = GlyphMapForStandardFonts[code];
         }
+        var isIdentityUnicode = this.toUnicode instanceof IdentityToUnicodeMap;
+        if (!isIdentityUnicode) {
+          this.toUnicode.forEach(function(charCode, unicodeCharCode) {
+            map[+charCode] = unicodeCharCode;
+          });
+        }
         this.toFontChar = map;
         this.toUnicode = new ToUnicodeMap(map);
       } else if (/Symbol/i.test(fontName)) {

test/pdfs/.gitignore

@@ -59,6 +59,7 @@
 !bug864847.pdf
 !issue1002.pdf
 !issue925.pdf
+!issue2840.pdf
 !issue4668.pdf
 !issue5039.pdf
 !issue5070.pdf

test/pdfs/issue2840.pdf

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test/test_manifest.json

@@ -746,6 +746,13 @@
        "type": "eq",
        "about": "Seac with differences array that messes up mapping."
     },
+    {  "id": "issue2840",
+       "file": "pdfs/issue2840.pdf",
+       "md5": "d9df49f6d62668d099e0fb7e74f8f337",
+       "rounds": 1,
+       "link": false,
+       "type": "eq"
+    },
     {  "id": "bug866395",
        "file": "pdfs/bug866395.pdf",
        "md5": "f03bc77e84637241980b09a0a220f575",