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


var toFontChar = [],
      unicode;
    for (var i = 0, ii = encoding.length; i < ii; i++) {
      unicode = getUnicodeForGlyph(encoding[i], glyphsUnicodeMap);
      if (unicode !== -1) {
        toFontChar[i] = unicode;
      }
    }
    for (var charCode in differences) {
      unicode = getUnicodeForGlyph(differences[charCode], glyphsUnicodeMap);
      if (unicode !== -1) {
        toFontChar[+charCode] = unicode;
      }
    }
    return toFontChar;
  }
  /**
   * Rebuilds the char code to glyph ID map by moving all char codes to the
   * private use area. This is done to avoid issues with various problematic
   * unicode areas where either a glyph won't be drawn or is deformed by a
   * shaper.
   * @returns {Object} Two properties:
   * 'toFontChar' - maps original char codes(the value that will be read
   * from commands such as show text) to the char codes that will be used in the
   * font that we build
   * 'charCodeToGlyphId' - maps the new font char codes to glyph ids
   */
  function adjustMapping(charCodeToGlyphId, hasGlyph, newGlyphZeroId) {