The most convenient way to export .rfa files (Revit Architecture) family data would be to use the original program itself. If you do not have access to Revit, you will have to rely on the OBJ Export for Revit utility that is available as free download from Autodesk website.
Convert Autodesk Revit Architecture family data to Adobe Portable document format.
We found 2 software records in the database related to .rfa to .pdf file format conversion.
Microsoft Windows software - convert rfa to pdf on Windows
A Revit app for object export
Convert from rfa file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned rfa to pdf. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A building design software from Autodesk