If this is a file you have encountered personally, it is important to exercise caution. Generic numbered .rar files are often used to distribute:

: Do not extract the contents unless you are absolutely certain of the source, as .rar files can contain scripts that execute upon opening.

: Private users often name backup files with dates or internal reference numbers that have no meaning to the public. Recommendations:

: Attackers frequently use non-descript names to hide malware, trojans, or ransomware.