Occasionally I have to work with some huge documents, typically as PDFs, but I don’t always have my laptop with the full Acrobat package on it. When that happens, and I need to break the PDFs up, I use a free online PDF splitter tool called PDFSplit! – which is available here.
It can extract all pages in a PDF to individual PDFs, or just grab a certain section of a PDF and save it into a new file. It’s quick. It’s online. And it’s free.