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
readPostScriptTable(tables.post, properties, numGlyphs);
      }
      
      tables.post = {
        tag: "post",
        data: createPostTable(properties),
      };
      const charCodeToGlyphId = [];
      
      function hasGlyph(glyphId) {
        return !missingGlyphs[glyphId];
      }
      if (properties.composite) {
        var cidToGidMap = properties.cidToGidMap || [];
        var isCidToGidMapEmpty = cidToGidMap.length === 0;
        properties.cMap.forEach(function (charCode, cid) {
          if (cid > 0xffff) {
            throw new FormatError("Max size of CID is 65,535");
          }
          var glyphId = -1;
          if (isCidToGidMapEmpty) {
            glyphId = cid;
          } else if (cidToGidMap[cid] !== undefined) {
            glyphId = cidToGidMap[cid];
          }
          if (glyphId >= 0 && glyphId < numGlyphs && hasGlyph(glyphId)) {
            charCodeToGlyphId[charCode] = glyphId;
          }
        });
      } else {