It claims you must open the attachment immediately to avoid a fine or a delivery failure.
You aren't expecting a compressed file from the sender. How to Protect Yourself If you encounter this file or subject line: hm.rar
For further information on identifying malicious attachments, you can check resources from the Federal Trade Commission (FTC) on Phishing . If you’d like, I can help you: Draft a for your team or employees. It claims you must open the attachment immediately