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
j = 10,
          flagsCount = 0;
        for (i = 0; i < contoursCount; i++) {
          var endPoint = (glyf[j] << 8) | glyf[j + 1];
          flagsCount = endPoint + 1;
          j += 2;
        }
        
        var instructionsStart = j;
        var instructionsLength = (glyf[j] << 8) | glyf[j + 1];
        glyphProfile.sizeOfInstructions = instructionsLength;
        j += 2 + instructionsLength;
        var instructionsEnd = j;
        
        var coordinatesLength = 0;
        for (i = 0; i < flagsCount; i++) {
          var flag = glyf[j++];
          if (flag & 0xc0) {
            
            glyf[j - 1] = flag & 0x3f;
          }
          let xLength = 2;
          if (flag & 2) {
            xLength = 1;
          } else if (flag & 16) {
            xLength = 0;
          }
          let yLength = 2;
          if (flag & 4) {
            yLength = 1;