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):

if (!isDict(params)) {
      return str; 
    }
    var predictor = (this.predictor = params.get("Predictor") || 1);
    if (predictor <= 1) {
      return str; 
    }
    if (predictor !== 2 && (predictor < 10 || predictor > 15)) {
      throw new FormatError(`Unsupported predictor: ${predictor}`);
    }
    if (predictor === 2) {
      this.readBlock = this.readBlockTiff;
    } else {
      this.readBlock = this.readBlockPng;
    }
    this.str = str;
    this.dict = str.dict;
    var colors = (this.colors = params.get("Colors") || 1);
    var bits = (this.bits = params.get("BitsPerComponent") || 8);
    var columns = (this.columns = params.get("Columns") || 1);