Enable loading of PDFs with invalid document information dictionaries

src/core.js

@@ -457,9 +457,13 @@ var PDFDocument = (function PDFDocumentClosure() {
         PDFFormatVersion: this.pdfFormatVersion,
         IsAcroFormPresent: !!this.acroForm
       };
-      if (this.xref.trailer.has('Info')) {
-        var infoDict = this.xref.trailer.get('Info');
-
+      var infoDict;
+      try {
+        infoDict = this.xref.trailer.get('Info');
+      } catch (err) {
+        info('The document information dictionary is invalid.');
+      }
+      if (infoDict) {
         var validEntries = DocumentInfoValidators.entries;
         // Only fill the document info with valid entries from the spec.
         for (var key in validEntries) {
@@ -468,7 +472,7 @@ var PDFDocument = (function PDFDocumentClosure() {
             // Make sure the value conforms to the spec.
             if (validEntries[key](value)) {
               docInfo[key] = typeof value !== 'string' ? value :
-                             stringToPDFString(value);
+                stringToPDFString(value);
             } else {
               info('Bad value in document info for "' + key + '"');
             }

test/pdfs/issue2853.pdf.link

@@ -0,0 +1 @@
+http://www.celgene.de/Patienten/Newsletter-Epigenetik-201301.pdf

test/test_manifest.json

@@ -1310,5 +1310,14 @@
        "firstPage": 1,
        "lastPage": 1,
        "type": "eq"
+    },
+    {  "id": "issue2853",
+       "file": "pdfs/issue2853.pdf",
+       "md5": "9f0ad95ef0b243ee8813c4eca0f7a042",
+       "rounds": 1,
+       "link": true,
+       "firstPage": 1,
+       "lastPage": 1,
+       "type": "load"
     }
 ]