You could take a look at PDF Utilities (poppler-utils via Synaptic or apt-get) which includes pdftotext:
Poppler is a PDF rendering library based on Xpdf PDF viewer.
This package contains command line utilities (based on Poppler) for getting
information of PDF documents, convert them to other formats, or manipulate
them:
* pdfdetach -- lists or extracts embedded files (attachments)
* pdffonts -- font analyzer
* pdfimages -- image extractor
* pdfinfo -- document information
* pdfseparate -- page extraction tool
* pdftocairo -- PDF to PNG/JPEG/PDF/PS/EPS/SVG converter using Cairo
* pdftohtml -- PDF to HTML converter
* pdftoppm -- PDF to PPM/PNG/JPEG image converter
* pdftops -- PDF to PostScript (PS) converter
* pdftotext -- text extraction
* pdfunite -- document merging tool
Of course, success will depend on how the pdf file was generated. If you get what you want as a text file, you could then save that as an .odt file.
Edit: I forgot to provide the source for the quote. It's from the description tab in Synaptic for PDF Utilities (based on Poppler).