Open a PDF in Illustrator

Besides Acrobat, Illustrator is one of the few software programs that can open and edit PDF files. Go to File>Open and target the PDF file. If it is a multipage document, a dialog will appear that allows you to navigate to the single page you'd like to open. (Unfortunately, you'll have to base that decision on a pretty small preview window.) If you open a page, edit it, and choose Save in the File menu, it will be saved back as part of the multipage document. To separate the image from the multipage document converting it into a one-page PDF file choose Save As from the File menu, rename the file, and click Save.