
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)


properties.seacMap = seacMap;
      }
      var unitsPerEm = 1 / (properties.fontMatrix || FONT_IDENTITY_MATRIX)[0];
      var builder = new OpenTypeFileBuilder("\x4F\x54\x54\x4F");
      
      builder.addTable("CFF ", font.data);
      
      builder.addTable(
        "OS/2",
        createOS2Table(properties, newMapping.charCodeToGlyphId)
      );
      
      builder.addTable(
        "cmap",
        createCmapTable(newMapping.charCodeToGlyphId, numGlyphs)
      );
      
      builder.addTable(
        "head",
        "\x00\x01\x00\x00" + 
          "\x00\x00\x10\x00" + 
          "\x00\x00\x00\x00" + 
          "\x5F\x0F\x3C\xF5" + 
          "\x00\x00" + 
          safeString16(unitsPerEm) + 
          "\x00\x00\x00\x00\x9e\x0b\x7e\x27" + 
          "\x00\x00\x00\x00\x9e\x0b\x7e\x27" + 
          "\x00\x00" + 
          safeString16(properties.descent) + 
          "\x0F\xFF" +