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):

case "TrueType":
        case "CIDFontType2":
          this.mimetype = "font/opentype";
          
          
          data = this.checkAndRepair(name, file, properties);
          if (this.isOpenType) {
            adjustWidths(properties);
            type = "OpenType";
          }
          break;
        default:
          throw new FormatError(`Font ${type} is not supported`);
      }
    } catch (e) {
      warn(e);
      this.fallbackToSystemFont(properties);
      return;
    }
    amendFallbackToUnicode(properties);
    this.data = data;
    this.fontType = getFontType(type, subtype, properties.isStandardFont);
    
    this.fontMatrix = properties.fontMatrix;
    this.widths = properties.widths;
    this.defaultWidth = properties.defaultWidth;
    this.toUnicode = properties.toUnicode;
    this.seacMap = properties.seacMap;
  }
  get renderer() {