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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.
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.