If you have to deal with PDFs frequently, Adobe Illustrator would be an excellent investment.
I've had lots of grief trying to import PDFs directly into CorelDRAW and Flexi. I always get much better results when being able to open the PDF in Illustrator, do work on the file in there (like getting rid of various clipping masks, expanding strokes, etc.) and ending up with artwork that can actually be sent to a vinyl plotter or computerized routing table.