Attach (recommended) or Link to PDF file here:
[chinese.pdf](https://github.com/mozilla/pdf.js/files/6404389/download.1.pdf)

Configuration:
- Web browser and its version:90.0.4430.93
- Operating system and its version: mac 10.15.5
- PDF.js version: 2.9.146
- Is a browser extension:no

Steps to reproduce the problem:
1. The Chinese in the attachment cannot be rendered

Brower ✅
![image](https://user-images.githubusercontent.com/13477114/116678074-81782a00-a9db-11eb-8719-74f48fcebc2b.png)

PDF.js ❌ [https://mozilla.github.io/pdf.js/web/viewer.html](https://mozilla.github.io/pdf.js/web/viewer.html)
![image](https://user-images.githubusercontent.com/13477114/116678212-a371ac80-a9db-11eb-847f-dd1ad7752c13.png)


What is the expected behavior? (add screenshot)
**The Chinese character can be rendered**
What went wrong? (add screenshot)
**All of the Chinese character cannot be rendered**
Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

const unitsPerEm =
    override.unitsPerEm ||
    1 / (properties.fontMatrix || FONT_IDENTITY_MATRIX)[0];
  
  
  const scale = properties.ascentScaled
    ? 1.0
    : unitsPerEm / PDF_GLYPH_SPACE_UNITS;
  const typoAscent =
    override.ascent || Math.round(scale * (properties.ascent || bbox[3]));
  let typoDescent =
    override.descent || Math.round(scale * (properties.descent || bbox[1]));
  if (typoDescent > 0 && properties.descent > 0 && bbox[1] < 0) {
    typoDescent = -typoDescent; 
  }
  const winAscent = override.yMax || typoAscent;
  const winDescent = -override.yMin || -typoDescent;
  return (
    "\x00\x03" + 
    "\x02\x24" + 
    "\x01\xF4" + 
    "\x00\x05" + 
    "\x00\x00" + 
    "\x02\x8A" + 
    "\x02\xBB" + 
    "\x00\x00" + 
    "\x00\x8C" + 
    "\x02\x8A" + 
    "\x02\xBB" + 
    "\x00\x00" +