Attach (recommended) or Link to PDF file here:
[Test file.pdf](https://github.com/mozilla/pdf.js/files/4656226/Test.file.pdf)

Configuration:
- Web browser and its version: Chrome Version 81.0.4044.138 (Official Build) (64-bit)
- Operating system and its version: Windows 10
- PDF.js version: latest
- Is a browser extension: no

Steps to reproduce the problem:
1. Open [https://mozilla.github.io/pdf.js/web/viewer.html](https://mozilla.github.io/pdf.js/web/viewer.html)
2. Load the provided .pdf file

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/5569382/82438616-02c3fe80-9aa2-11ea-9003-b75ea1e7aac6.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/5569382/82438640-09527600-9aa2-11ea-810b-071da7e37896.png)


switch (transferMaps.length) {
        case 1:
          transferMapRed = transferMaps[0];
          transferMapGreen = transferMaps[0];
          transferMapBlue = transferMaps[0];
          transferMapGray = transferMaps[0];
          break;
        case 4:
          transferMapRed = transferMaps[0];
          transferMapGreen = transferMaps[1];
          transferMapBlue = transferMaps[2];
          transferMapGray = transferMaps[3];
          break;
      }
    }
    
    
    if (imgData.kind === ImageKind.GRAYSCALE_1BPP) {
      
      const srcLength = src.byteLength;
      const dest32 = new Uint32Array(dest.buffer, 0, dest.byteLength >> 2);
      const dest32DataLength = dest32.length;
      const fullSrcDiff = (width + 7) >> 3;
      let white = 0xffffffff;
      let black = IsLittleEndianCached.value ? 0xff000000 : 0x000000ff;
      if (transferMapGray) {
        if (transferMapGray[0] === 0xff && transferMapGray[0xff] === 0) {
          [white, black] = [black, white];
        }
      }