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 header = file.peekBytes(4);
    return bytesToString(header) === "ttcf";
  }
  function isOpenTypeFile(file) {
    var header = file.peekBytes(4);
    return bytesToString(header) === "OTTO";
  }
  function isType1File(file) {
    var header = file.peekBytes(2);
    
    if (header[0] === 0x25 && header[1] === 0x21) {
      return true;
    }
    
    
    if (header[0] === 0x80 && header[1] === 0x01) {
      return true;
    }
    return false;
  }
  /**
   * Compared to other font formats, the header in CFF files is not constant
   * but contains version numbers. To reduce the possibility of misclassifying
   * font files as CFF, it's recommended to check for other font formats first.
   */
  function isCFFFile(file) {