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
const map = this._map;
      if (map.length <= 0x10000) {
        return map.indexOf(value);
      }
      for (const charCode in map) {
        if (map[charCode] === value) {
          return charCode | 0;
        }
      }
      return -1;
    },
    amend(map) {
      for (var charCode in map) {
        this._map[charCode] = map[charCode];
      }
    },
  };
  return ToUnicodeMap;
})();
var IdentityToUnicodeMap = (function IdentityToUnicodeMapClosure() {
  
  function IdentityToUnicodeMap(firstChar, lastChar) {
    this.firstChar = firstChar;
    this.lastChar = lastChar;
  }
  IdentityToUnicodeMap.prototype = {
    get length() {