You can use tools such as The Unarchiver or Keka to decompress these files.
Files with the extension are data containers that use the Roshal Archive (RAR) format to store one or more files in a smaller, compressed state to save space or facilitate faster transfers. Understanding RAR Files
Where did you this file from, and are you having trouble extracting its contents? rar - ArchWiki
Because "53458.rar" is a generic numeric name, it is often used in automated downloads, software patches, or driver updates. Before opening any RAR file from an unknown source, you should such as Avast or Bitdefender to ensure it does not contain malicious scripts or executables.