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):

header31012 +
    format31012
  );
}
function validateOS2Table(os2, file) {
  file.pos = (file.start || 0) + os2.offset;
  const version = file.getUint16();
  
  
  file.skip(60); 
  const selection = file.getUint16();
  if (version < 4 && selection & 0x0300) {
    return false;
  }
  const firstChar = file.getUint16();
  const lastChar = file.getUint16();
  if (firstChar > lastChar) {
    return false;
  }
  file.skip(6); 
  const usWinAscent = file.getUint16();
  if (usWinAscent === 0) {
    
    return false;
  }
  
  os2.data[8] = os2.data[9] = 0; 
  return true;
}
function createOS2Table(properties, charstrings, override) {