Any CAD drawing (including IRF) can be simply print as PDF files in any programs that support certain formats. So for example AutoCAD can import IRF drawings and using the PDF export function make the document.
Convert Autodesk Impression drawing to Adobe Portable document format.
We found one software available in the database for this conversion.
Microsoft Windows software - convert irf to pdf on Windows
Leading 2D and 3D CAD development software from Autodesk
Convert from irf 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.