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 NAME_RECORD_LENGTH = 12;
        var i, ii;
        for (
          i = 0;
          i < numRecords && font.pos + NAME_RECORD_LENGTH <= end;
          i++
        ) {
          var r = {
            platform: font.getUint16(),
            encoding: font.getUint16(),
            language: font.getUint16(),
            name: font.getUint16(),
            length: font.getUint16(),
            offset: font.getUint16(),
          };
          
          if (
            (r.platform === 1 && r.encoding === 0 && r.language === 0) ||
            (r.platform === 3 && r.encoding === 1 && r.language === 0x409)
          ) {
            records.push(r);
          }
        }
        for (i = 0, ii = records.length; i < ii; i++) {
          var record = records[i];
          if (record.length <= 0) {
            continue; 
          }
          var pos = start + stringsStart + record.offset;
          if (pos + record.length > end) {