You can use the free online version of NANO Antivirus to check suspicious files without a registration and an installation of the program.
To start scanning press the "Browse" button and select the file. Note that the maximum size of the file you can check with Online scanner is limited to 20 MB. You can also upload archives of RAR or ZIP format, including password protected (use '123' as password).
Then press the "Scan" button and wait for result. The scanning process can take a few minutes, it depends on the speed of your internet connection and the loading of our server.