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


properties.seacMap = seacMap;
      }
      var unitsPerEm = 1 / (properties.fontMatrix || FONT_IDENTITY_MATRIX)[0];
      var builder = new OpenTypeFileBuilder("\x4F\x54\x54\x4F");
      
      builder.addTable("CFF ", font.data);
      
      builder.addTable(
        "OS/2",
        createOS2Table(properties, newMapping.charCodeToGlyphId)
      );
      
      builder.addTable(
        "cmap",
        createCmapTable(newMapping.charCodeToGlyphId, numGlyphs)
      );
      
      builder.addTable(
        "head",
        "\x00\x01\x00\x00" + 
          "\x00\x00\x10\x00" + 
          "\x00\x00\x00\x00" + 
          "\x5F\x0F\x3C\xF5" + 
          "\x00\x00" + 
          safeString16(unitsPerEm) + 
          "\x00\x00\x00\x00\x9e\x0b\x7e\x27" + 
          "\x00\x00\x00\x00\x9e\x0b\x7e\x27" + 
          "\x00\x00" + 
          safeString16(properties.descent) + 
          "\x0F\xFF" +