Pretty much any CAD file can be exported as PDF document for printing purposes, so export of DXF files via dxf to pdf conversion is certainly doable. Such conversion can be done with pretty much any CAD software either with dedicated export function or simply by printing using virtual PDF printer. A viable option would be with some DXF viewers that usually offer printing function as well.
Open DXF file Open PDF fileA CAD and Gerber conversion software
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