
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)


var unitsPerEm =
      override.unitsPerEm ||
      1 / (properties.fontMatrix || FONT_IDENTITY_MATRIX)[0];
    
    
    var scale = properties.ascentScaled
      ? 1.0
      : unitsPerEm / PDF_GLYPH_SPACE_UNITS;
    var typoAscent =
      override.ascent || Math.round(scale * (properties.ascent || bbox[3]));
    var typoDescent =
      override.descent || Math.round(scale * (properties.descent || bbox[1]));
    if (typoDescent > 0 && properties.descent > 0 && bbox[1] < 0) {
      typoDescent = -typoDescent; 
    }
    var winAscent = override.yMax || typoAscent;
    var winDescent = -override.yMin || -typoDescent;
    return (
      "\x00\x03" + 
      "\x02\x24" + 
      "\x01\xF4" + 
      "\x00\x05" + 
      "\x00\x00" + 
      "\x02\x8A" + 
      "\x02\xBB" + 
      "\x00\x00" + 
      "\x00\x8C" + 
      "\x02\x8A" + 
      "\x02\xBB" + 
      "\x00\x00" +