The ".rar" extension is a compressed archive file (similar to a .zip file). The "[XYZ]" part is commonly added by users or groups who repackaged or uploaded the file.
Files with names indicating they are from unofficial sources (often found in forums or file-sharing sites) can pose significant risks. They may contain: Malware, ransomware, or viruses. Adobe Acrobat DC 22.002.20191 U2B macOS [XYZ].rar
This refers to a specific version number of the software, indicating it is an older version from the 2022 release cycle. Adobe Acrobat DC 22.002.20191 U2B macOS [XYZ].rar
Unwanted, modified, or cracked software that bypasses Adobe licensing. Adobe Acrobat DC 22.002.20191 U2B macOS [XYZ].rar