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
var op = data[i++];
          
          
          if (op === 0x40) {
            
            n = data[i++];
            if (inFDEF || inELSE) {
              i += n;
            } else {
              for (j = 0; j < n; j++) {
                stack.push(data[i++]);
              }
            }
          } else if (op === 0x41) {
            
            n = data[i++];
            if (inFDEF || inELSE) {
              i += n * 2;
            } else {
              for (j = 0; j < n; j++) {
                b = data[i++];
                stack.push((b << 8) | data[i++]);
              }
            }
          } else if ((op & 0xf8) === 0xb0) {
            
            n = op - 0xb0 + 1;
            if (inFDEF || inELSE) {
              i += n;
            } else {