You should be able to export C4D format to PDF in Adobe Photoshop, either via the export function or virtual PDF printer. But this is highly strange type of conversion.
Convert CINEMA 4D file format to Adobe Portable document format.
We found one software available in the database for this conversion.
Microsoft Windows software - convert c4d to pdf on Windows
One of the best bitmap graphic editing program
Convert from c4d 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.