With Acrobat installed, place the document you want to scan in the scanner off and on.
Open Acrobat and go to File> Create> PDF from Scanner.
You will see that you appear several options on the type of document you want to scan (color, grayscale, etc.). Choose the most suitable.
As you click on any of the first five options, the default, will start the scanning process.
When finished, a dialog system asks if you want to scan more pages. Choose the option that is and click on OK.
You will see that the document will appear already in the Acrobat viewer as a new PDF. To save it, I close it by clicking on the blade that appears in the upper right corner and when asked if you want to save the document, say yes. You've scanned directly to PDF!