You can use Automator - find these two functions Split pdf and Combine pdf pages. Use the Split function to “blow up” the document into individual pages delete the pages you need not in the new document Use Cobine pdf pages to stich the pages back again into the document. May be tedious and error prone with large documents. There is a whole lot of good pdf editors for Mac around, some of them do have free trials, so if you need to do this once, you can live with a free trial. Pdf Merging Online DC is a classical tool, but is now available only as a subscription. PDF Elements Pro works well, also Quoppa PDF Studio (both paid, but reasonably). There are also a few on-line pdf editors, some for free, thus if your document is not confidential or too personal, you can check the online things. Google around a bit.
There are plenty of places that sell or support Adobe PDF tools. The Adobe team makes free software for Macs and PCs, like Tempo, so be mindful before you buy it from a third party, you might need it later for some reason. If you need to make a PDF with multiple images, use Preview for Mac or Preview for Windows. For example, if you want to print two pages at once on two pages of paper on both Mac OS X and Windows, you can do that with Preview. You can make a PDF in Adobe Reader as well, use Preview to view it. Then open the PDF with Preview, and you can print from Photoshop or Illustrator or whatever you are using. Then open the PDF again in Adobe Reader. Sometimes, you want to export your PDF to a word (.doc) file. Adobe Acrobat Pro and PDF Studio are excellent choices..