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 ranges = getRanges(glyphs, numGlyphs);
    var numTables = ranges[ranges.length - 1][1] > 0xffff ? 2 : 1;
    var cmap =
      "\x00\x00" + 
      string16(numTables) + 
      "\x00\x03" + 
      "\x00\x01" + 
      string32(4 + numTables * 8); 
    var i, ii, j, jj;
    for (i = ranges.length - 1; i >= 0; --i) {
      if (ranges[i][0] <= 0xffff) {
        break;
      }
    }
    var bmpLength = i + 1;
    if (ranges[i][0] < 0xffff && ranges[i][1] === 0xffff) {
      ranges[i][1] = 0xfffe;
    }
    var trailingRangesCount = ranges[i][1] < 0xffff ? 1 : 0;
    var segCount = bmpLength + trailingRangesCount;
    var searchParams = OpenTypeFileBuilder.getSearchParams(segCount, 2);
    
    var startCount = "";
    var endCount = "";
    var idDeltas = "";
    var idRangeOffsets = "";