It depends a lot on the exact version you're using. In early versions of Acrobat, there was no way to simply add a blank page into a PDF ! In more recent versions of Acrobat or other applications it's not a problem anymore. Heck, even the simple Preview app on Mac can insert a blank page.
In current versions of Acrobat (the one with colourful tool icons) you can insert a blank page through the Pages panel's dropdown menu.
Oorspronkelijk geplaatst op Quora: How do you add a new page to a PDF in Adobe Acrobat?"