At least some of the various ARC files in existence are documents, or other file types that could be exported as PDF documents. You can usually do that with some kind of dedicated PDF export function in the program that opens your PDF format. There is always the possibility of using the Print function and a virtual PDF printer to do the job.
Convert I-DEAS archive to Adobe Portable document format.
We have found 3 software records in our database eligible for .arc to .pdf file format conversion.
Microsoft Windows software - convert arc to pdf on Windows
A CAD converter with huge format support
Convert from arc 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 arc 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.
On-line services software - convert arc to pdf on web
A commercial online CAD converter
An online CAD conversion service