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
encodingId: -1,
            mappings: [],
            hasShortCmap: false,
          };
        }
        var format = file.getUint16();
        file.skip(2 + 2); 
        var hasShortCmap = false;
        var mappings = [];
        var j, glyphId;
        
        if (format === 0) {
          for (j = 0; j < 256; j++) {
            var index = file.getByte();
            if (!index) {
              continue;
            }
            mappings.push({
              charCode: j,
              glyphId: index,
            });
          }
          hasShortCmap = true;
        } else if (format === 4) {
          
          
          var segCount = file.getUint16() >> 1;
          file.skip(6); 
          var segIndex,
            segments = [];