Summarize the following:
OS X includes the ability to create PDF files, which will allow you to copy out the page that you want into a new PDF. You can do this from any program that can open a PDF, including Preview, Adobe Reader, or any web browser. You can find this in the File menu, or by pressing ⌘ Command+P. You'll see several options. Use the "Pages" drop-down menu to select which page you want to copy to the new PDF file. This will allow you to save the file as a new PDF file. The new PDF containing the page that you copied from the original will be created in the location you specified.

Summary:
Open the PDF in any program. Open the Print menu. Click the "PDF" drop-down menu at the bottom of the window. Specify the page that you want to copy. Select "Save as PDF." Give the new PDF a name and select a location to save it.