Stop retyping. Reuse your content. Convert your PDFs to Microsoft Word, Excel, and PowerPoint ...

The subject of this post reads like spam. But spam isn't being posted to the Adobe Community forums. It is spam that I can't get rid of it in the Adobe Acrobat Pro application. It seems that each day, whenever I open a PDF in Adobe Acrobat Pro, it overlays a block reading:

Stop retyping. Reuse your content.
Convert your PDFs to Microsoft Word, Excel, and PowerPoint files in seconds with the Export a PDF tool.
Try it now.

If I hit the "X" to close the block it does disappear, but only to reappear again another day.

How do I permanently eliminate the spam and nagware that Adobe added to Adobe Acrobat Pro?