Compressed archives like .rar can be used to bypass some email or browser security scans to hide malicious executables.
If you need to use BurnInTest, it is highly recommended to follow these steps to ensure your system's safety:
PassMark allows you to install BurnInTest on a USB drive legally using their WinPE Builder . PassMark BurnInTest for Windows download page
The name ("Archivo de Descarga..." is Spanish for "Download File") suggests this is a repackaged version from a file-sharing site or blog rather than the official developer.
If you have already opened the file, run a full system scan using a trusted antivirus like Malwarebytes or Windows Security .