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
var cmapTable = readCmapTable(
          tables.cmap,
          font,
          this.isSymbolicFont,
          properties.hasEncoding
        );
        var cmapPlatformId = cmapTable.platformId;
        var cmapEncodingId = cmapTable.encodingId;
        var cmapMappings = cmapTable.mappings;
        var cmapMappingsLength = cmapMappings.length;
        let baseEncoding = [];
        if (
          properties.hasEncoding &&
          (properties.baseEncodingName === "MacRomanEncoding" ||
            properties.baseEncodingName === "WinAnsiEncoding")
        ) {
          baseEncoding = getEncoding(properties.baseEncodingName);
        }
        
        
        
        if (
          properties.hasEncoding &&
          !this.isSymbolicFont &&
          ((cmapPlatformId === 3 && cmapEncodingId === 1) ||
            (cmapPlatformId === 1 && cmapEncodingId === 0))
        ) {
          var glyphsUnicodeMap = getGlyphsUnicode();