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
this.missingFile = true;
      
      
      var name = this.name;
      var type = this.type;
      var subtype = this.subtype;
      let fontName = name.replace(/[,_]/g, "-").replace(/\s/g, "");
      var stdFontMap = getStdFontMap(),
        nonStdFontMap = getNonStdFontMap();
      const isStandardFont = !!stdFontMap[fontName];
      const isMappedToStandardFont = !!(
        nonStdFontMap[fontName] && stdFontMap[nonStdFontMap[fontName]]
      );
      fontName = stdFontMap[fontName] || nonStdFontMap[fontName] || fontName;
      this.bold = fontName.search(/bold/gi) !== -1;
      this.italic =
        fontName.search(/oblique/gi) !== -1 ||
        fontName.search(/italic/gi) !== -1;