You can certainly setup a rule for anything that has attachments, and you could even tell it if it contains "pdf" in the subect line. However, to tell it to specifically only look at certain types of attachments, you may have to write a short VBA script instead of just using the rules wizard. That's from the Outlook side. I do not know if the Exchange console provides more flexibility without code.
"But thanks be to God, which giveth us the victory through our Lord Jesus Christ." 1 Corinthians 15:57