Breaking down the file name gives us immediate clues:
xf-adsk2018-x64.exe is a well-known crack tool, often called a "keygen," created by the underground hacking group Xf-adsk2018-x64.exe UPD
Before you run Xf-adsk2018-x64.exe and reformat your hard drive, consider that you have legal, safe options for using professional CAD software. Breaking down the file name gives us immediate
Search engines show many results for Xf-adsk2018-x64.exe UPD with file sizes ranging from 500KB to 15MB. If you see a file larger than 2MB labeled as "UPD," it is almost certainly a bundled installer containing adware, browser hijackers (e.g., Search Marquis), or remote access trojans (RATs). Avoid running Xf-adsk2018-x64
Avoid running Xf-adsk2018-x64.exe UPD unless you obtained it directly from a trusted, official source. For legitimate Autodesk use, obtain software and updates only via Autodesk’s official channels or authorized resellers.