"Callout" portion of document (zoom in & pull out section)

The "callout" function in Adobe is not what I have typcially referred to as a "callout" function. In the legal world, a callout is where a portion of a document is selected and expanded (calledout) on top of the current document. Much like zooming on a particular section of the document while still having the rest of the document visible in the background.

I am trying to draw attention to the signature of a document exhibit in a court. I can use the snapshop and paste as a stamp function, but if I increase the size, I lose the quality of the resolution.

Is there an equivalent function in Acrobat Professional 8?

Thanks...