In Google Sites, there are a couple of gadgets you can choose to embed objects (e.g., Google Docs Viewer, iWrapper).
The image below shows a pdf that has been embedded using the Google Docs Viewer gadget. It is important to make sure you understand what is meant by the term “embed.” When you “embed” an object, you display its content as a part of your current site.
The pdf could be your resume or some other artifact you want to share. Several students have asked how to embed a Portable Document Format (pdf) in their presentation portfolio.