The filename also appears in the digital archives of South Kazakhstan University (SKU). In this context, it is used to store educational papers or textbooks, such as "Criminal Law of the Republic of Kazakhstan".
Scan it with a security tool like to check for malicious signatures. 21354.rar
Check the file path; if it is in a temporary folder ( %TEMP% ), it may be a leftover from a software installer. The filename also appears in the digital archives