Attach (recommended) or Link to PDF file here:
[双引号不正常.pdf](https://github.com/mozilla/pdf.js/files/3533108/default.pdf)


Configuration:
- Web browser and its version:  IE11 , chrome 
- Operating system and its version:  win7
- PDF.js version:  master
- Is a browser extension: nothing 
teps to reproduce the problem:
1. viewer.html web  online preview


What is the expected behavior? (add screenshot)
Displayed in normal characters.

What went wrong? (add screenshot)
![20190823143813](https://user-images.githubusercontent.com/6269307/63571860-062e6600-c5b4-11e9-9fff-75d65cf6bade.png)

Not only the two characters I took screenshots, but also a lot of garbled Chinese punctuation. For example, the Chinese 《》 symbol. But these garbled characters only appear in some specific very old pdf files.

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):nothing 

const firstEntryLength = itemDecode(locaData, itemSize);
        if (newGlyfData.length > firstEntryLength + writeOffset) {
          glyf.data = newGlyfData.subarray(0, firstEntryLength + writeOffset);
        } else {
          glyf.data = new Uint8Array(firstEntryLength + writeOffset);
          glyf.data.set(newGlyfData.subarray(0, writeOffset));
        }
        glyf.data.set(newGlyfData.subarray(0, firstEntryLength), writeOffset);
        itemEncode(
          loca.data,
          locaData.length - itemSize,
          writeOffset + firstEntryLength
        );
      } else {
        glyf.data = newGlyfData.subarray(0, writeOffset);
      }
      return {
        missingGlyphs,
        maxSizeOfInstructions,
      };
    }
    function readPostScriptTable(post, propertiesObj, maxpNumGlyphs) {
      const start = (font.start ? font.start : 0) + post.offset;
      font.pos = start;
      const length = post.length,
        end = start + length;
      const version = font.getInt32();