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 

font = new Stream(new Uint8Array(font.getBytes()));
    let header, tables;
    if (isTrueTypeCollectionFile(font)) {
      const ttcData = readTrueTypeCollectionData(font, this.name);
      header = ttcData.header;
      tables = ttcData.tables;
    } else {
      header = readOpenTypeHeader(font);
      tables = readTables(font, header.numTables);
    }
    let cff, cffFile;
    const isTrueType = !tables["CFF "];
    if (!isTrueType) {
      const isComposite =
        properties.composite &&
        ((properties.cidToGidMap || []).length > 0 ||
          !(properties.cMap instanceof IdentityCMap));
      
      if (
        (header.version === "OTTO" && !isComposite) ||
        !tables.head ||
        !tables.hhea ||
        !tables.maxp ||
        !tables.post
      ) {
        
        cffFile = new Stream(tables["CFF "].data);
        cff = new CFFFont(cffFile, properties);
        adjustWidths(properties);
        return this.convert(name, cff, properties);