Hi Erich,
Are they working hyperlinks to external files in your Excel file.

Are they  hyperlinks known to Excel  (ctrl+k), or
are they  HYPERLINK Worksheet Formulas.

If HYPERLINK Worksheet Formulas do they involve
concatenation.

Do you get a hyperlink in the PDF that you have to correct,
if so what did it look like,  or  does it appear as plain text
with the descriptive name only.

I expect that you might need to use  http://www.ibm.com
and not  www.ibm.com

I take it that if you are editing PDF files that you are quite possibly
actually using  Adobe Acrobat and the Distiller.   Don't know if it
would make any difference but is your system PC or MAC.

For an Excel newsgroup I think  excel.misc   would have been
a better choice,  but I see why chose this group.  The main
thing for now is to fill in the missing
information as to what software you are using -- what is generating
the PDF, and what do you have in the cells.  There must be nothing
but the hyperllink in a cell.
---
HTH,
David McRitchie, Microsoft MVP - Excel
My Excel Pages:  http://www.mvps.org/dmcritchie/excel/excel.htm
Search Page:        http://www.mvps.org/dmcritchie/excel/search.htm