To delete a page in a PDF go to:
Document > Pages > Delete
Deleting Noncontiguous Pages
Open the PDF file
In the Navigation pane, select the Pages tab
Select the first page to be deleted
Press and hold [Ctrl]
Select the other page(s) to be deleted
From the Document menu, select Pages » Delete
The Delete Pages dialog box appears.
NOTE: The Selected option will be designated.Click OK
The Adobe Acrobat confirmation box appears.To delete the pages, click OK