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
const { numFonts, offsetTable } = readTrueTypeCollectionHeader(ttc);
        for (let i = 0; i < numFonts; i++) {
          ttc.pos = (ttc.start || 0) + offsetTable[i];
          const potentialHeader = readOpenTypeHeader(ttc);
          const potentialTables = readTables(ttc, potentialHeader.numTables);
          if (!potentialTables.name) {
            throw new FormatError(
              'TrueType Collection font must contain a "name" table.'
            );
          }
          const nameTable = readNameTable(potentialTables.name);
          for (let j = 0, jj = nameTable.length; j < jj; j++) {
            for (let k = 0, kk = nameTable[j].length; k < kk; k++) {
              const nameEntry = nameTable[j][k];
              if (nameEntry && nameEntry.replace(/\s/g, "") === fontName) {
                return {
                  header: potentialHeader,
                  tables: potentialTables,
                };
              }
            }
          }