Attach (recommended) or Link to PDF file here:  [test.pdf](https://akmer.aikucun.com/a94a8fe5ccb19ba61c4c0873d391e987982fbbd3_1616477914120_83.pdf)


Configuration:
- Web browser and its version: chrome 87.0.4280.88
- Operating system and its version: windows10
- PDF.js version: 2.6.347
- Is a browser extension:

Steps to reproduce the problem:
1. just open 

What is the expected behavior? (add screenshot)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/17724610/112087066-473f8f80-8bc8-11eb-8efb-56139ec42a9c.png)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

pa = -pa;
          }
          var pb = p - up;
          if (pb < 0) {
            pb = -pb;
          }
          var pc = p - upLeft;
          if (pc < 0) {
            pc = -pc;
          }
          c = rawBytes[i];
          if (pa <= pb && pa <= pc) {
            buffer[j++] = left + c;
          } else if (pb <= pc) {
            buffer[j++] = up + c;
          } else {
            buffer[j++] = upLeft + c;
          }
        }
        break;
      default:
        throw new FormatError(`Unsupported predictor: ${predictor}`);
    }
    this.bufferLength += rowBytes;
  };
  return PredictorStream;
})();
var DecryptStream = (function DecryptStreamClosure() {
  
  function DecryptStream(str, maybeLength, decrypt) {