Currently the Acrobat version is "XI" (no "12").
With Acrobat XI installed:
"File - Save As Other" --- from here you pick the supported file format for the export.
If a PDF has content that is the output of a scanner then that output (as is the case for All scanners' output) is a picture of text and not real text.
During an export all that can be processed is the picture. As a picture of text is not text it is understandable why Word (or other word processors) cannot edit the content.
So, for such, prior to export run Acrobat's OCR and save.
The export will be of the OCR content.
Do expect to do clean of the text, spelling, punctuation, layout etc.
This may be minor. This may be major. But, there will be some.
Adobe as some online subscription services that can take a "proper" PDF (NOT all are eh) and export to supported file formats.
Two are "ExportPDF" and "PDF Pack".