Even cut & paste may be problematic.
As George stated - Actobat Is Not an Authoring Application.
More to the point is that PDF (the file format / technology) Is Not (By Design) a word processing file format
PDF (defined by the ISO Standard ISO 32000) does not tolerate word processing like editing (of content, of "styles", of layout, etc.)
Minor touchups of PDF are possible. Best to use for this Is Acrobat.
To EDIT:
Use the source authoring file and then create a fresh PDF.
Or
Use Acrobat XI or the appropriate Adobe hosted online subscription service to export the PDF content to a Word file. Clean up. Edit. Create a fresh PDF.
Be well...