ZAMZAR web conversion services claims that it can convert PDF documents to OpenDocument drawing. In any case it might also be possible to export PDF to some vector based graphics format like SVG and then use it as basis for creating ODG drawing in OpenOffice.org Draw or similar.
Convert Adobe Portable document format to OpenDocument drawing.
We found one software available in the database for this conversion.
Multiplatform software - convert pdf to odg on any platform
A vector graphics editor
Convert from pdf file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.