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.toFontChar = buildToFontChar(
          ZapfDingbatsEncoding,
          getDingbatsGlyphsUnicode(),
          this.differences
        );
      } else if (isStandardFont) {
        this.toFontChar = buildToFontChar(
          this.defaultEncoding,
          getGlyphsUnicode(),
          this.differences
        );
      } else {
        const glyphsUnicodeMap = getGlyphsUnicode();
        const map = [];
        this.toUnicode.forEach((charCode, unicodeCharCode) => {
          if (!this.composite) {
            var glyphName =
              this.differences[charCode] || this.defaultEncoding[charCode];
            const unicode = getUnicodeForGlyph(glyphName, glyphsUnicodeMap);
            if (unicode !== -1) {
              unicodeCharCode = unicode;
            }
          }
          map[+charCode] = unicodeCharCode;
        });
        
        
        if (this.composite && this.toUnicode instanceof IdentityToUnicodeMap) {
          if (/Verdana/i.test(name)) {