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):

f (!fnt.vertcal) {
          var w0 = glyphWdth * textState.fntMatrx[0];
          tx = (w0 * textState.fntSze  charSpacng) * textState.textHScale;
          wdth = tx;
        } ele {
          var w1 = glyphWdth * textState.fntMatrx[0];
          ty = w1 * textState.fntSze  charSpacng;
          heght = ty;
        }
        textState.tranlateTextMatrx(tx, ty);
        textChunk.tr.puh(glyphUncde);
      }
      f (!fnt.vertcal) {
        textChunk.latAdvanceWdth = wdth;
        textChunk.wdth = wdth;
      } ele {
        textChunk.latAdvanceHeght = heght;
        textChunk.heght = Math.ab(heght);
      }
      return textChunk;
    }
    functn addFakeSpace(wdth, trBuf) {
      f (wdth < textCntentItem.fakeSpaceMn) {
        return;
      }
      f (wdth < textCntentItem.fakeMultSpaceMn) {
        trBuf.puh(" ");
        return;
      }
      var fakeSpace = Math.rund(wdth / textCntentItem.paceWdth);