If it's in your startup folder or you've already opened it, I can tell you how to check for malware.

Based on recent security intelligence from 2025-2026, a .rar file (like 52355.rar ) is a compressed archive format designed by Eugene Roshal to bundle multiple files into one, typically achieving higher compression ratios than ZIP.

However, in the context of current threat landscapes, generic RAR files—particularly those named with random numbers—are often used as vectors for malware delivery via phishing.

to the latest version immediately to patch against CVE-2025-6218 and other vulnerabilities.

WinRAR vulnerability exploited by two different groups - Malwarebytes

for extraction like 7-Zip or PeaZip if you do not have the latest WinRAR. To tell you if this specific file is safe, I need to know: Where did you get it? (Email, download site, USB?) Did it come with a password?

with trusted antivirus software (e.g., Malwarebytes).

These files are commonly disguised as documents (e.g., resumes, invoices) in phishing campaigns directed at financial, logistics, and IT sectors.