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


"The numOfMetrics (" +
              numOfMetrics +
              ") should not be " +
              "greater than the numGlyphs (" +
              numGlyphs +
              ")"
          );
          
          numOfMetrics = numGlyphs;
          header.data[34] = (numOfMetrics & 0xff00) >> 8;
          header.data[35] = numOfMetrics & 0x00ff;
        }
        var numOfSidebearings = numGlyphs - numOfMetrics;
        var numMissing =
          numOfSidebearings - ((metrics.length - numOfMetrics * 4) >> 1);
        if (numMissing > 0) {
          
          
          
          var entries = new Uint8Array(metrics.length + numMissing * 2);
          entries.set(metrics.data);
          if (dupFirstEntry) {
            
            entries[metrics.length] = metrics.data[2];
            entries[metrics.length + 1] = metrics.data[3];
          }
          metrics.data = entries;
        }
      }
      function sanitizeGlyph(