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


charCodeToGlyphId,
          hasGlyph,
          glyphZeroId
        );
        this.toFontChar = newMapping.toFontChar;
        tables.cmap = {
          tag: "cmap",
          data: createCmapTable(newMapping.charCodeToGlyphId, numGlyphsOut),
        };
        if (!tables["OS/2"] || !validateOS2Table(tables["OS/2"], font)) {
          tables["OS/2"] = {
            tag: "OS/2",
            data: createOS2Table(
              properties,
              newMapping.charCodeToGlyphId,
              metricsOverride
            ),
          };
        }
      }
      if (!isTrueType) {
        try {
          
          cffFile = new Stream(tables["CFF "].data);
          var parser = new CFFParser(
            cffFile,
            properties,
            SEAC_ANALYSIS_ENABLED
          );
          cff = parser.parse();