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
}
          }
        } else if (cmapPlatformId === 0) {
          
          for (let i = 0; i < cmapMappingsLength; ++i) {
            charCodeToGlyphId[cmapMappings[i].charCode] =
              cmapMappings[i].glyphId;
          }
        } else {
          
          
          
          
          
          
          
          
          
          
          for (let i = 0; i < cmapMappingsLength; ++i) {
            let charCode = cmapMappings[i].charCode;
            if (
              cmapPlatformId === 3 &&
              charCode >= 0xf000 &&
              charCode <= 0xf0ff
            ) {
              charCode &= 0xff;
            }
            charCodeToGlyphId[charCode] = cmapMappings[i].glyphId;
          }