The phrase "now" pressures you to act before thinking.
The subject line you provided——is a classic red flag for a phishing attack or malware delivery . Since 156 MB is an unusually large size for a standard document (like an invoice or a PDF), it is often used by attackers to bypass simple antivirus scanners or to hide complex malicious code.
Turn off your Wi-Fi or unplug your ethernet cable immediately to stop the malware from "calling home" to a command server.
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