We have found one software suitable in our database for this conversion.
SFW files (Seattle Film Works) are very old and typically not supported in modern graphics tool, still some users might find these images on Internet or their old computers. Your best option in this case for any kind of export of .sfw files is to use XnView or similar file viewer that supports large number of even legacy files. As for export to PDF via sfw to pdf conversion, this is just a matter of using print function and virtual PDF printer.
Updated: October 19, 2023
SFW
Files with sfw extension could be, especially in the past, found as special graphics from Seattle Film Works. Pretty outdated file format.
PDF
A pdf file extension is mainly used for Adobe Portable document format, commonly referred to as PDF. All programs that create some sort of documents or projects offer the possibility to export their format to PDF format. A free PDF viewer (Adobe Reader) is available for download from Adobe website.