How do I edit PDF background

Open the PDF file, the background is white, but watching a long time, could not take their eyes a little, I would like to ask, is there any way to change the background color of it?

to amend the PDF.you have to use Adobe Illustrator or CorelDRAW to enter into PDF of the two inside.and then modify the output PDF.Direct PDF is not modified.can be put inside the PS revised Ah ai use Adobe Acrobat to open this document, the menu, the document – the background – to add or replace a very simple
you are using a version of what? My 8.0 is Adobe Acrobat is not some Adobe reader