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 streamBytesLength = streamBytes.length;
    var signatureLength = signature.length;
    var scanLength = streamBytesLength - signatureLength;
    var i = startIndex,
      j,
      found = false;
    while (i < scanLength) {
      j = 0;
      while (j < signatureLength && streamBytes[i + j] === signature[j]) {
        j++;
      }
      if (j >= signatureLength) {
        
        i += j;
        while (i < streamBytesLength && isWhiteSpace(streamBytes[i])) {
          i++;
        }
        found = true;
        break;
      }
      i++;
    }
    return {
      found,
      length: i,
    };
  }
  function getHeaderBlock(stream, suggestedLength) {