s/w for ocr to pdf

Most ocr s/w I see transfers the text to a document. Is there program
that will retain the formatting and graphics of the document and place
ocr in a hidden part of the document. This way I can scan to pdf and
it would look like the original document except I'd also have the open
of search for keywords that would show up in the ocr part. My main
problem is performing ocr on handwritten text and I'd prefer the ocr
just perform on the type written text that it can easily read.

Thanks,
Pete