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 

FormatError,
  info,
  isNum,
  shadow,
  string32,
  warn,
} from "../shared/util.js";
import { CFFCompiler, CFFParser } from "./cff_parser.js";
import {
  FontFlags,
  getFontType,
  MacStandardGlyphOrdering,
  normalizeFontName,
  recoverGlyphName,
  SEAC_ANALYSIS_ENABLED,
} from "./fonts_utils.js";
import { getDingbatsGlyphsUnicode, getGlyphsUnicode } from "./glyphlist.js";
import {
  getEncoding,
  MacRomanEncoding,
  StandardEncoding,
  SymbolSetEncoding,
  ZapfDingbatsEncoding,
} from "./encodings.js";
import {
  getGlyphMapForStandardFonts,
  getNonStdFontMap,
  getStdFontMap,
  getSupplementalGlyphMapForArialBlack,
  getSupplementalGlyphMapForCalibri,