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
suggestedLength - 2 * EEXEC_SIGNATURE.length
      );
      if (block.found && block.length === suggestedLength) {
        return {
          stream: new Stream(headerBytes),
          length: suggestedLength,
        };
      }
    }
    warn('Invalid "Length1" property in Type1 font -- trying to recover.');
    stream.pos = streamStartPos; 
    var SCAN_BLOCK_LENGTH = 2048;
    var actualLength;
    while (true) {
      var scanBytes = stream.peekBytes(SCAN_BLOCK_LENGTH);
      block = findBlock(scanBytes, EEXEC_SIGNATURE, 0);
      if (block.length === 0) {
        break;
      }
      stream.pos += block.length; 
      if (block.found) {
        actualLength = stream.pos - streamStartPos;
        break;
      }
    }
    stream.pos = streamStartPos; 
    if (actualLength) {
      return {
        stream: new Stream(stream.getBytes(actualLength)),
        length: actualLength,