I know this thread is 4 years old, but I found a solution which might be of use to people who have the same problem and find this thread via Google (as I did).
Extract the PDF page as a separate PDF, then save that PDF as a Word document (saving the original PDF may crash some PCs!), ungroup the desired image from the page's other images (right click the desired image, go to 'group', click 'ungroup', repeat as necessary), then just copy and paste as normal. Inexplicably, it worked! I copied it into Word (where I write up my notes), and I couldn't see it - because it was merging with the text weirdly, so 'format --> wrap text --> in line' fixes it.
Again, apologies for the extreme necro-thread, hopefully this solution helps some people! Paizo art is g$$-d+$n gorgeous, and I love it in my notes.