The use of special characters like the dollar sign ( $ ) and numbers in the name ( Fir$t-21U ) is a common tactic used to bypass automated spam filters or to mimic "leaked" or "cracked" software files.
If you were looking for a specific program, only download it from the . Fir$t-21U.rar
Run a full system scan using a reputable antivirus like Microsoft Defender or Malwarebytes . The use of special characters like the dollar