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


codes = range[2];
        var code = codes[0];
        for (j = 1, jj = codes.length; j < jj; ++j) {
          if (codes[j] !== codes[j - 1] + 1) {
            end = range[0] + j - 1;
            format31012 +=
              string32(start) + 
              string32(end) + 
              string32(code); 
            start = end + 1;
            code = codes[j];
          }
        }
        format31012 +=
          string32(start) + 
          string32(range[1]) + 
          string32(code); 
      }
      header31012 =
        "\x00\x0C" + 
        "\x00\x00" + 
        string32(format31012.length + 16) + 
        "\x00\x00\x00\x00" + 
        string32(format31012.length / 12); 
    }
    return (
      cmap +
      "\x00\x04" + 
      string16(format314.length + 4) + 
      format314 +