Adobe ACROBAT READER 7.0 Manual page 43

Navigating documents with file attachments
The creator of a PDF document can attach PDF and non-PDF files to the document. If you
open a PDF document that has files attached, the Attachment icon appears in the
status bar at the bottom of the Adobe Reader window. Attached files are listed in the
Attachments tab in the navigation pane. You can open these files for viewing, edit the file
attachments and save your changes to the file attachment. (See Opening and saving
attachments.)