Many of us not find the convertor like .pdf to .odt .xls many more format.
Unoconv is command based utility which conver the file into different file format
accoding to your choice.

Steps

Install Unoconv
yum install http://pkgs.repoforge.org/unoconv/un....rf.noarch.rpm

unoconv --show : gives the supported file formats
unoconf -f pdf yourfilename.odt : conversts libre office file to pdf.
unoconv -f doc yourfilename.odt : conversts libre office file to doc.

unoconv --listener & :--to enable the listener if its not working

NOTE: It needs some libre office installed and some libre office files.If you have libre office then no issue with unoconv.