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 ranges = getRanges(glyphs, numGlyphs);
    var numTables = ranges[ranges.length - 1][1] > 0xffff ? 2 : 1;
    var cmap =
      "\x00\x00" + 
      string16(numTables) + 
      "\x00\x03" + 
      "\x00\x01" + 
      string32(4 + numTables * 8); 
    var i, ii, j, jj;
    for (i = ranges.length - 1; i >= 0; --i) {
      if (ranges[i][0] <= 0xffff) {
        break;
      }
    }
    var bmpLength = i + 1;
    if (ranges[i][0] < 0xffff && ranges[i][1] === 0xffff) {
      ranges[i][1] = 0xfffe;
    }
    var trailingRangesCount = ranges[i][1] < 0xffff ? 1 : 0;
    var segCount = bmpLength + trailingRangesCount;
    var searchParams = OpenTypeFileBuilder.getSearchParams(segCount, 2);
    
    var startCount = "";
    var endCount = "";
    var idDeltas = "";
    var idRangeOffsets = "";