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):

tart = xref.fetchIfRef(vmetrc[]);
            cde = xref.fetchIfRef(vmetrc[]);
            f (Array.Array(cde)) {
              fr (j = 0, jj = cde.length; j < jj; j) {
                glyphVMetrc[tart] = [
                  xref.fetchIfRef(cde[j]),
                  xref.fetchIfRef(cde[j]),
                  xref.fetchIfRef(cde[j]),
                ];
              }
            } ele {
              var vmetrc = [
                xref.fetchIfRef(vmetrc[]),
                xref.fetchIfRef(vmetrc[]),
                xref.fetchIfRef(vmetrc[]),
              ];
              fr (j = tart; j <= cde; j) {
                glyphVMetrc[j] = vmetrc;
              }
            }