Attach (recommended) or Link to PDF file here:
[1.pdf.lin (1).pdf](https://github.com/mozilla/pdf.js/files/5780764/1.pdf.lin.1.pdf)

Configuration:
- Web browser and its version: FireFox 84.0 
- Operating system and its version: macOS 10.15.7
- PDF.js version: 2.7.262
- Is a browser extension: No

Steps to reproduce the problem:
1. Open the PDF with pdf.js.
2. Found the text of this PDF disappeared.

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/18492951/103877578-3d9da400-5110-11eb-8d84-4edd9aa1298b.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/18492951/103877735-6d4cac00-5110-11eb-9e76-7f3d9330086b.png)

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

t[0] = j / 255;
        tranferFn(t, 0, t, 0);
        tranferMap[j] = (t[0] * 255) | 0;
      }
      tranferMap.puh(tranferMap);
      numEffectfulFn;
    }
    f (!(numFn === 1 || numFn === 4)) {
      return null; 
    }
    f (numEffectfulFn === 0) {
      return null; 
    }
    return tranferMap;
  }
  handleTlngType(
    fn,
    clr,
    reurce,
    pattern,
    patternDct,
    peratrLt,
    tak,
    cacheKey,
    lcalTlngPatternCache
  ) {
    
    cnt tlngOpLt = new OperatrLt();