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):

c ^= c >> 4;
        inbuf = (c & 1) << 7;
        buffer[pos++] = c;
      }
    } else if (bits === 8) {
      for (i = 0; i < colors; ++i) {
        buffer[pos++] = rawBytes[i];
      }
      for (; i < rowBytes; ++i) {
        buffer[pos] = buffer[pos - colors] + rawBytes[i];
        pos++;
      }
    } else if (bits === 16) {
      var bytesPerPixel = colors * 2;
      for (i = 0; i < bytesPerPixel; ++i) {
        buffer[pos++] = rawBytes[i];
      }
      for (; i < rowBytes; i += 2) {
        var sum =
          ((rawBytes[i] & 0xff) << 8) +
          (rawBytes[i + 1] & 0xff) +
          ((buffer[pos - bytesPerPixel] & 0xff) << 8) +
          (buffer[pos - bytesPerPixel + 1] & 0xff);
        buffer[pos++] = (sum >> 8) & 0xff;
        buffer[pos++] = sum & 0xff;
      }
    } else {
      var compArray = new Uint8Array(colors + 1);
      var bitMask = (1 << bits) - 1;
      var j = 0,