does Acrobat cache pdfs?

I uploaded PDFs to our company website. A day later I needed to edit the pdfs. Safari continues to show the old version despite my having selected "clear history" and "empty caches" in the browser. I had someone view the files on another computer and they confirmed the new versions are being displayed yet I continue to see the old version. Might adobe's pdf viewer plugin have it's own cache separate from the browser? If so, how can I clear this. Thank you.