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


return !missingGlyphs[glyphId];
      }
      if (properties.composite) {
        var cidToGidMap = properties.cidToGidMap || [];
        var isCidToGidMapEmpty = cidToGidMap.length === 0;
        properties.cMap.forEach(function (charCode, cid) {
          if (cid > 0xffff) {
            throw new FormatError("Max size of CID is 65,535");
          }
          var glyphId = -1;
          if (isCidToGidMapEmpty) {
            glyphId = cid;
          } else if (cidToGidMap[cid] !== undefined) {
            glyphId = cidToGidMap[cid];
          }
          if (glyphId >= 0 && glyphId < numGlyphs && hasGlyph(glyphId)) {
            charCodeToGlyphId[charCode] = glyphId;
          }
        });
      } else {
        
        
        var cmapTable = readCmapTable(
          tables.cmap,
          font,
          this.isSymbolicFont,
          properties.hasEncoding
        );