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


if (!tables.head) {
        throw new FormatError('Required "head" table is not found');
      }
      sanitizeHead(tables.head, numGlyphs, isTrueType ? tables.loca.length : 0);
      var missingGlyphs = Object.create(null);
      if (isTrueType) {
        var isGlyphLocationsLong = int16(
          tables.head.data[50],
          tables.head.data[51]
        );
        var glyphsInfo = sanitizeGlyphLocations(
          tables.loca,
          tables.glyf,
          numGlyphs,
          isGlyphLocationsLong,
          hintsValid,
          dupFirstEntry,
          maxSizeOfInstructions
        );
        missingGlyphs = glyphsInfo.missingGlyphs;
        
        
        if (version >= 0x00010000 && tables.maxp.length >= 22) {
          tables.maxp.data[26] = glyphsInfo.maxSizeOfInstructions >> 8;
          tables.maxp.data[27] = glyphsInfo.maxSizeOfInstructions & 255;
        }
      }
      if (!tables.hhea) {
        throw new FormatError('Required "hhea" table is not found');
      }