Robert is correct, you need the original file and the application that created it. Have had to edit PDFs for companies in the past and it is a major, major pain and often doesn’t turn out particularly well.
PDF format is not intended for edition. So, you’d better get the original file if you want to do heavy edition.
If what you want to do is touching it ‘here and there’ or making changes like ‘everything that is blue xxx has to be orange yyy’ or things like that, you need the full Acrobat plus a plug-in like PitStop (not freeware at all: www.enfocus.com. If you want to try it and you have full Acrobat, its demo is fully operative for 30 days).
Photoshop is perhaps one of the less suitable tools you might use to touch a PDF, specially a multipage one. Illustrator may do the task but with a lot of ‘ifs’ and ‘depending on’. The combination Acrobat+InDesign+PitStop is awesome for this kind of things.
Learn how to optimize Photoshop for maximum speed, troubleshoot common issues, and keep your projects organized so that you can work faster than ever before!
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