I have Pub 2003 and Acrobat Pro 6 and the short answer is that it doesn't allow for direct .pdf saves from within Publisher, like it does in Word, etc. So you will have to export the file to some other format. I would suggest to find yourself a pdf file converter; there are free ones around, or you can get Acrobat. You may have some trouble keeping all of your .pub format info in any kind of a conversion....
I just did a simple trial of saving a Publisher file as a web page, and then opening that in Acrobat. That worked, and it seems like that may be a way to go in order to save the look of your catalog.
good luck,
kip