If you can open it in Acrobat, here is how you do it:
This is an Adobe forum, so mentions of other software products is not appropriate.
Except when other products are able to solve a problem that Adobe's software can't. This is basic functionality and should be part of Adobe Reader.
Install a pdf file printer driver and print the rotated file to the "pdf" printer. It will ask you for a file name to "print" to. The "printed" file will open in the correct orientation.
Europe, Middle East and Africa