Is it a XFA PDF document? Please let us know the application used to create the PDF document?
Are you able to open other PDF documents perfectly?
PDF files created by some non-Adobe products aren't structurally correct. Adobe Acrobat Reader try their best to open even such PDF files but they do differ in terms of the kind of such pdf files they are able to open.
It seems your file got corrupted for some reason. We would like to investigate the issue and it would be really helpful if you could mail the document which got corrupted to email@example.com.
Adobe Acrobat Team