How to add background to PDF

I want to add background to multiple pdf pages. The background comes in pdf format and contains both the header and footer.

I have tried many different methods and all of them didn’t work for me.
Can anyone please help me with this?

What have you tested so far and could you also elaborate what was not working?

Some pdfs have solid backgrounds so it won’t matter how you overlay them with each other. One of them will always obscure the other.

Does it look OK when you use the Add Background command in Acrobat Pro (More > Background > Add)?

If it does, and you prefer a free alternative, there are free third party PDF tools that could help you do that. E.g. PDFtk Server,