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 

tables.head.data[51]
      );
      const glyphsInfo = sanitizeGlyphLocations(
        tables.loca,
        tables.glyf,
        numGlyphs,
        isGlyphLocationsLong,
        hintsValid,
        dupFirstEntry,
        maxSizeOfInstructions
      );
      missingGlyphs = glyphsInfo.missingGlyphs;
      
      
      if (version >= 0x00010000 && tables.maxp.length >= 22) {
        tables.maxp.data[26] = glyphsInfo.maxSizeOfInstructions >> 8;
        tables.maxp.data[27] = glyphsInfo.maxSizeOfInstructions & 255;
      }
    }
    if (!tables.hhea) {
      throw new FormatError('Required "hhea" table is not found');
    }
    
    
    if (tables.hhea.data[10] === 0 && tables.hhea.data[11] === 0) {
      tables.hhea.data[10] = 0xff;
      tables.hhea.data[11] = 0xff;
    }