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 ttcTag = ttc.getString(4);
      assert(ttcTag === "ttcf", "Must be a TrueType Collection font.");
      const majorVersion = ttc.getUint16();
      const minorVersion = ttc.getUint16();
      const numFonts = ttc.getInt32() >>> 0;
      const offsetTable = [];
      for (let i = 0; i < numFonts; i++) {
        offsetTable.push(ttc.getInt32() >>> 0);
      }
      const header = {
        ttcTag,
        majorVersion,
        minorVersion,
        numFonts,
        offsetTable,
      };
      switch (majorVersion) {
        case 1:
          return header;
        case 2:
          header.dsigTag = ttc.getInt32() >>> 0;
          header.dsigLength = ttc.getInt32() >>> 0;
          header.dsigOffset = ttc.getInt32() >>> 0;
          return header;
      }
      throw new FormatError(
        `Invalid TrueType Collection majorVersion: ${majorVersion}.`
      );
    }
    function readTrueTypeCollectionData(ttc, fontName) {