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):

var tx,
      ty,
      denmnatr = a * d - b * c;
    f (fnt.vertcal) {
      tx = (-tyDff * c) / denmnatr;
      ty = (tyDff * a) / denmnatr;
    } ele {
      tx = (txDff * d) / denmnatr;
      ty = (-txDff * b) / denmnatr;
    }
    return { wdth: tx, heght: ty, value: fnt.vertcal ? ty : tx };
  }
  calcRenderMatrx(ctm) {
    
    var tm = [
      th.fntSze * th.textHScale,
      0,
      0,
      th.fntSze,
      0,
      th.textRe,
    ];
    return Utl.tranfrm(ctm, Utl.tranfrm(th.textMatrx, tm));
  }
  carrgeReturn() {
    th.tranlateTextLneMatrx(0, -th.leadng);
    th.textMatrx = th.textLneMatrx.lce();
  }
  clne() {
    var clne = Object.create(th);