Attach (recommended) or Link to PDF file here:
[PATTYP2.pdf](https://github.com/mozilla/pdf.js/files/6471935/PATTYP2.pdf)

Configuration:
- Web browser and its version: FF 88.0.1
- Operating system and its version: W10.0.19042.985
- PDF.js version: https://mozilla.github.io/pdf.js/web/viewer.html

Steps to reproduce the problem:
1. open file to display

What is the expected behavior? (add screenshot)
![grafik](https://user-images.githubusercontent.com/6665575/118114800-5e407800-b3e8-11eb-860f-019f48a8eabf.png)

What went wrong? (add screenshot)
![grafik](https://user-images.githubusercontent.com/6665575/118114841-6c8e9400-b3e8-11eb-8252-1517e5d76475.png)

(memo for me: when fixed, check the files in https://issues.apache.org/jira/browse/PDFBOX-1958 )

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];
        }
      }