The latest version DC will do it but its not very user friendly - see below
Save a PDF
Use this method to save PDFs, including PDF Portfolios, and PDFs in which you have added comments, form field entries, and digital signatures.
Note:
Saving a digitally signed PDF invalidates the signature.
Do one of the following:
To save changes to the current file, choose File > Save.
To save a copy of a PDF, choose File > Save As.
In Acrobat Reader DC, choose File > Save As or File > Save As Other > Text.
To save a copy of a PDF Portfolio, choose File >Save As Other > PDF Portfolio.
If you are viewing a PDF in a web browser, the Acrobat File menu is not available. Use the Save A Copy button in the Acrobat toolbar to save the PDF.