Is there a way I can convert from PDF to Corel?

Hallo.
I have these free beautiful posters in Adobe PDF formats that I would like to develop further to use in my projects. Unfortunately, this cannot be done in any PDF professional application, or so I guess, and therefore I would like to import them to Corel Draw which I very well know how to use. Is there a way to convert from PDF to Corel Draw? Thanks a bunch.
