At CreativePro.com, Kelly Vaughn wrote a helpful step-by-step article on how to extract a vector logo from a PDF. If your client gives you a PDF of a document, and it includes a vector version of their logo, you can use Acrobat Professional to extract it.
Note: be sure to read the Comments, as there is also a shorter way to accomplish this in Adobe Illustrator.
Read the story at http://www.creativepro.com/article/extract-vector-logos-pdfs
Jay Nelson is the editorial director of PlanetQuark.com, and the editor and publisher of Design Tools Monthly. He’s also the author of the QuarkXPress 8 and QuarkXPress 7 training titles at Lynda.com, as well as the training videos Quark includes in the box with QuarkXPress 7 . In addition, Jay writes regularly for Macworld and Photoshop User magazines and speaks at industry events.