Aldiko 2 will open Adobe DRM'd PDF's. The easiest way is to either copy the .acsm file to your devices SD card and then use a file manager like Astro to open the .acsm and tell it to open the book in Aldiko (this is how the Aldiko folks tell you to do it) or plug your device into your computer and it should show up in ADE (bottom of the list on the left you'll see an icon and it should say Aldiko) where you can just drag and drop your book.
I tried both methods with both ePubs and PDFs for a review I just did at Dear Author and they worked fine...
http://dearauthor.com/wordpress/2011...roid-aldiko-2/
However PDF's don't reflow/change font size nor can you zoom/pan them in Aldiko so they may be hard to read.