Attach (recommended) or Link to PDF file here:
[test.pdf](https://github.com/mozilla/pdf.js/files/6270827/test.pdf)
Configuration:
- Web browser and its version:chrome 89
- Operating system and its version:win10
- PDF.js version: 2.4/2.7/2.8 no working
- Is a browser extension: no 

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/18545199/113852392-1ae26080-97cf-11eb-9dc9-0cecf52d267b.png)

What went wrong? (add screenshot)
![1617791294(1)](https://user-images.githubusercontent.com/18545199/113852355-10c06200-97cf-11eb-8672-598750f1093a.jpg)


console this log : **FormatError: TrueType Collection does not contain "DCWGQU+CambriaMath" font** 

any solution?thanks
cff.names = [name];
      var topDict = new CFFTopDict();
      
      
      topDict.setByName("version", 391);
      topDict.setByName("Notice", 392);
      topDict.setByName("FullName", 393);
      topDict.setByName("FamilyName", 394);
      topDict.setByName("Weight", 395);
      topDict.setByName("Encoding", null); 
      topDict.setByName("FontMatrix", properties.fontMatrix);
      topDict.setByName("FontBBox", properties.bbox);
      topDict.setByName("charset", null); 
      topDict.setByName("CharStrings", null); 
      topDict.setByName("Private", null); 
      cff.topDict = topDict;
      var strings = new CFFStrings();
      strings.add("Version 0.11"); 
      strings.add("See original notice"); 
      strings.add(name); 
      strings.add(name); 
      strings.add("Medium"); 
      cff.strings = strings;
      cff.globalSubrIndex = new CFFIndex();
      var count = glyphs.length;
      var charsetArray = [".notdef"];
      var i, ii;
      for (i = 0; i < count; i++) {
        const glyphName = charstrings[i].glyphName;
        const index = CFFStandardStrings.indexOf(glyphName);