I assume you have Adobe Acrobat XI (which is what you get with an Acrobat or a CC subscription).
When you open the print dialog in Acrobat, you have a number of different scaling options: Fit, Actual Size, Shrink oversized pages and Custom scale.
Does the print preview window show the page the same way it gets printed, or do you see that Acrobat thinks the page should fill the page? If it shows the small page centered on the sheet of paper, use either "Fit" or Custom Scale to print it bigger.
If this does not work, or if the preview window shows the page filled, then the problem is very likely with your printer driver. See if you can find an update for your driver.
Karl Heinz Kremer
PDF Acrobatics Without a Net
PDF Software Development, Training and More...
http://www.khkonsulting.com