Of all the alternative document processing suites to Microsoft Office, OpenOffice.org is by far one of the most popular. It's open source nature offers a more customized and flexible user experience with convenient add-ons developed by a large community of dedicated users.
Thus, it comes as no surprise that PDF files are often converted into the Writer (.odt) format as well. You can do two things to convert your PDF to OpenOffice document formats. One basic way is to copy the material from your PDF file and paste it into a new Writer document. Another is to export and save your PDF document in MS Word format and re-save it as an .ODT Writer file. Take a look.
Your PDF content will then be saved in the OpenOfficer Writer file format. Of course, for more convenience, there are PDF tools that can convert PDF to ODT directly. Using one can save you the hassle of having to re-save your content from .docx to .odt and help your PDF conversion go more smoothly.