Adobe Acrobat 7 Professional - Manual (Page 66)

Navigating documents with file attachments
Acrobat lets you attach any file to an Adobe PDF document so that any user can open it
for viewing. If the PDF document is moved to a new location, your attachment
automatically goes with it. If you open a PDF document that has files attached, the
Attachment icon appears in the Status tray. You can open these files for viewing, edit
the file attachments, and save your changes to the attachment. (See Opening and saving
attachments .)