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
if (privateUseAreaIndex >= PRIVATE_USE_AREAS.length) {
          warn("Ran out of space in font private use area.");
          break;
        }
        nextAvailableFontCharCode = PRIVATE_USE_AREAS[privateUseAreaIndex][0];
        privateUseOffetEnd = PRIVATE_USE_AREAS[privateUseAreaIndex][1];
      }
      var fontCharCode = nextAvailableFontCharCode++;
      if (glyphId === 0) {
        glyphId = newGlyphZeroId;
      }
      newMap[fontCharCode] = glyphId;
      toFontChar[originalCharCode] = fontCharCode;
    }
    return {
      toFontChar,
      charCodeToGlyphId: newMap,
      nextAvailableFontCharCode,
    };
  }
  function getRanges(glyphs, numGlyphs) {
    
    
    var codes = [];
    for (var charCode in glyphs) {
      
      if (glyphs[charCode] >= numGlyphs) {
        continue;
      }
      codes.push({ fontCharCode: charCode | 0, glyphId: glyphs[charCode] });