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
for (i = 0, ii = fields.length; i < ii; i++) {
        var field = fields[i];
        if (!(field in properties.privateData)) {
          continue;
        }
        var value = properties.privateData[field];
        if (Array.isArray(value)) {
          
          
          for (var j = value.length - 1; j > 0; j--) {
            value[j] -= value[j - 1]; 
          }
        }
        privateDict.setByName(field, value);
      }
      cff.topDict.privateDict = privateDict;
      var subrIndex = new CFFIndex();
      for (i = 0, ii = subrs.length; i < ii; i++) {
        subrIndex.add(subrs[i]);
      }
      privateDict.subrsIndex = subrIndex;
      var compiler = new CFFCompiler(cff);
      return compiler.compile();
    },
  };
  return Type1Font;
})();
var CFFFont = (function CFFFontClosure() {
  
  function CFFFont(file, properties) {