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
return;
                  }
                  stack.length = newStackLength;
                } else if (
                  funcId in ttContext.functionsDefined &&
                  !functionsCalled.includes(funcId)
                ) {
                  callstack.push({ data, i, stackTop: stack.length - 1 });
                  functionsCalled.push(funcId);
                  pc = ttContext.functionsDefined[funcId];
                  if (!pc) {
                    warn("TT: CALL non-existent function");
                    ttContext.hintsValid = false;
                    return;
                  }
                  data = pc.data;
                  i = pc.i;
                }
              }
            }
          } else if (op === 0x2c && !tooComplexToFollowFunctions) {
            
            if (inFDEF || inELSE) {
              warn("TT: nested FDEFs not allowed");
              tooComplexToFollowFunctions = true;
            }
            inFDEF = true;
            
            lastDeff = i;
            funcId = stack.pop();