Google displays a yellow banner at the top of the screen if it identifies a shared file as likely phishing or malware.
Google Drive does not scan files larger than for viruses. When attempting to download such a file, you will see a message stating: "Google Drive can't scan this file for viruses" . Google Drive - Virus scan warning
If you trust the source, you can click "Download anyway" . Google displays a yellow banner at the top
For extra safety, you can download the file and scan it locally using your own antivirus software or upload it to VirusTotal (which supports files up to 650 MB). 2. Suspicious Content Detected Google Drive - Virus scan warning