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
delete tables.fpgm;
        delete tables.prep;
        delete tables["cvt "];
        this.isOpenType = true;
      } else {
        if (!tables.loca) {
          throw new FormatError('Required "loca" table is not found');
        }
        if (!tables.glyf) {
          warn('Required "glyf" table is not found -- trying to recover.');
          
          tables.glyf = {
            tag: "glyf",
            data: new Uint8Array(0),
          };
        }
        this.isOpenType = false;
      }
      if (!tables.maxp) {
        throw new FormatError('Required "maxp" table is not found');
      }
      font.pos = (font.start || 0) + tables.maxp.offset;
      var version = font.getInt32();
      const numGlyphs = font.getUint16();
      
      let numGlyphsOut = numGlyphs + 1;
      let dupFirstEntry = true;
      if (numGlyphsOut > 0xffff) {
        dupFirstEntry = false;
        numGlyphsOut = numGlyphs;