Attach (recommended) or Link to PDF file here:
https://web.archive.org/web/20091223123331/http://sci2s.ugr.es/keel/pdf/specific/articulo/alp99.pdf
(aka `tests/pdfs/issue1936.pdf`)
 
When I copy/paste the multiplication sign on the first line of the first page, I got a `£`.
And when I do the same in evince I got a `×` (the same in chrome).
The font descriptor is:
```
<< /Ascent 0 /CapHeight 749 /CharSet (/multiply) /Descent 0 /Flags 262212 /FontBBox [ -27 -940 1332 825 ] /FontFile3 59 0 R /FontName /KHPEPJ+CMBSY10 /ItalicAngle -14.035 /StemV 0 /Type /FontDescriptor >>
```
So it should be possible to guess the correct character in using the `CharSet` entry:
https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf#page=291


continue;
            }
            glyphName = this.differences[i] || baseEncoding[i];
            if (!glyphName) {
              continue;
            }
            const glyphId = properties.glyphNames.indexOf(glyphName);
            if (glyphId > 0 && hasGlyph(glyphId)) {
              charCodeToGlyphId[i] = glyphId;
            }
          }
        }
      }
      if (charCodeToGlyphId.length === 0) {
        
        charCodeToGlyphId[0] = 0;
      }
      
      
      
      
      let glyphZeroId = numGlyphsOut - 1;
      if (!dupFirstEntry) {
        glyphZeroId = 0;
      }
      
      
      if (!properties.cssFontInfo) {
        
        var newMapping = adjustMapping(