Depending on how complex the editing is, you could work on the pdf as an image (screenshoot then drop it into whatever graphics package you've got).
I did do that to get some text on top of the 1 page document; it works but is, to my mind, not very elegant.
There are a number of on-line offerings, not sure of the safety or whatever of them.
Tony
We have more and more laws, and less and less enforcement