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 isNarrow = name.search(/Narrow/g) !== -1;
    
    this.remeasure =
      (!isStandardFont || isNarrow) && Object.keys(this.widths).length > 0;
    if (
      (isStandardFont || isMappedToStandardFont) &&
      type === "CIDFontType2" &&
      this.cidEncoding.startsWith("Identity-")
    ) {
      const GlyphMapForStandardFonts = getGlyphMapForStandardFonts(),
        cidToGidMap = properties.cidToGidMap;
      
      
      const map = [];
      for (const charCode in GlyphMapForStandardFonts) {
        map[+charCode] = GlyphMapForStandardFonts[charCode];
      }
      if (/Arial-?Black/i.test(name)) {
        const SupplementalGlyphMapForArialBlack =
          getSupplementalGlyphMapForArialBlack();
        for (const charCode in SupplementalGlyphMapForArialBlack) {
          map[+charCode] = SupplementalGlyphMapForArialBlack[charCode];
        }
      } else if (/Calibri/i.test(name)) {
        const SupplementalGlyphMapForCalibri =
          getSupplementalGlyphMapForCalibri();
        for (const charCode in SupplementalGlyphMapForCalibri) {
          map[+charCode] = SupplementalGlyphMapForCalibri[charCode];