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):

font = new Stream(new Uint8Array(font.getBytes()));
    let header, tables;
    if (isTrueTypeCollectionFile(font)) {
      const ttcData = readTrueTypeCollectionData(font, this.name);
      header = ttcData.header;
      tables = ttcData.tables;
    } else {
      header = readOpenTypeHeader(font);
      tables = readTables(font, header.numTables);
    }
    let cff, cffFile;
    const isTrueType = !tables["CFF "];
    if (!isTrueType) {
      const isComposite =
        properties.composite &&
        ((properties.cidToGidMap || []).length > 0 ||
          !(properties.cMap instanceof IdentityCMap));
      
      if (
        (header.version === "OTTO" && !isComposite) ||
        !tables.head ||
        !tables.hhea ||
        !tables.maxp ||
        !tables.post
      ) {
        
        cffFile = new Stream(tables["CFF "].data);
        cff = new CFFFont(cffFile, properties);
        adjustWidths(properties);
        return this.convert(name, cff, properties);