
Attach (recommended) or Link to PDF file here:
[NAPEN16171380959.pdf](https://github.com/mozilla/pdf.js/files/6143802/NAPEN16171380959.pdf)

Configuration:
- Web browser and its version: Firefox 88 Nightly
- Operating system and its version: Windows 10
- PDF.js version:
- Is a browser extension: No

What went wrong? (add screenshot)
![](https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/images/2021-03-15-10-58-27-ce2796.png)


cff.names = [name];
      var topDict = new CFFTopDict();
      
      
      topDict.setByName("version", 391);
      topDict.setByName("Notice", 392);
      topDict.setByName("FullName", 393);
      topDict.setByName("FamilyName", 394);
      topDict.setByName("Weight", 395);
      topDict.setByName("Encoding", null); 
      topDict.setByName("FontMatrix", properties.fontMatrix);
      topDict.setByName("FontBBox", properties.bbox);
      topDict.setByName("charset", null); 
      topDict.setByName("CharStrings", null); 
      topDict.setByName("Private", null); 
      cff.topDict = topDict;
      var strings = new CFFStrings();
      strings.add("Version 0.11"); 
      strings.add("See original notice"); 
      strings.add(name); 
      strings.add(name); 
      strings.add("Medium"); 
      cff.strings = strings;
      cff.globalSubrIndex = new CFFIndex();
      var count = glyphs.length;
      var charsetArray = [".notdef"];
      var i, ii;
      for (i = 0; i < count; i++) {
        const glyphName = charstrings[i].glyphName;
        const index = CFFStandardStrings.indexOf(glyphName);