Converting a PDF to a DOC format can be challenging without Adobe Acrobat. As of October 2012, Acrobat XI Pro costs $199 on the Adobe website.But you don't necessarily need Acrobat to
convert pdf file to Word document. There're lots of PDF to word/ppt converter on the Internet, just type your question to google and there'll be many recommendations.
I don't have experience on
converting PDF file to PowerPoint, but you can try to save every page of the pdf file as image and export to a new PPT document.