I have to strongly disagree. Since google came out and said that no-follow links still have link juice, i've noticed that while a tiny amount does matter upon relevance, don't bother yourself entirely on it
I would assume that profile links on adobes forum would be pr0
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From my personal experience only backlinks with relevance to linked page matter.
If your target page is about "XYZ" and the page with the backlink is about "ABC" is all wothless on medium/long term.
I know couple of scammer who scam guestbook comment whos pr is 0. So I think it is better to place your link from pr0 to pr1-2. Because it is confirm your backlink will be there for centuries
Google sees it as a vote of confidence. It does not matter if the page you leave your link is PR0. As long as the Home page has a High Pr, you will see a move in SERP. This is from my experience.
I have a site ranked first page for a keyword that has over 33m results and all i did was profile backlinks from High PR sites.
Don`t let anyone tell you something doesn`t work, just go out and try it and prove if it does work or not!