Batch Conversion .cdr to .pdf

Hello everyone

I have to convert about 300.cdr to .pdf so a Friend can open them too.
It would take long time to do so manually for every document, so I want to ask, if it's possible to do this as a batch and how I do it?

I looked on Google but I didn't find anything solving my problem, so I'm asking directly here.

Many thanks,
Stefano