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
if (op >= 0x71 && op <= 0x75) {
              n = stack.pop();
              if (!isNaN(n)) {
                stackDelta = -n * 2;
              }
            }
            while (stackDelta < 0 && stack.length > 0) {
              stack.pop();
              stackDelta++;
            }
            while (stackDelta > 0) {
              stack.push(NaN); 
              stackDelta--;
            }
          }
        }
        ttContext.tooComplexToFollowFunctions = tooComplexToFollowFunctions;
        var content = [data];
        if (i > data.length) {
          content.push(new Uint8Array(i - data.length));
        }
        if (lastDeff > lastEndf) {
          warn("TT: complementing a missing function tail");
          
          
          content.push(new Uint8Array([0x22, 0x2d]));
        }
        foldTTTable(table, content);
      }
      function checkInvalidFunctions(ttContext, maxFunctionDefs) {