In the past week I've gotten identical "Invoice Payment Confirmation" emails from "Cloudhashing" and "Cointerra".
No text in the email -- just an attachment with a file called "invoice_772.jar"
Seems a phishing attempt too.
I too received fake invoice .JAR files from those two companies, but im a customer of both of those companies. Are you ALSO a customer of those companies as well? Or are they just random 'bitcoin related' companies being used to spoof the emails to try and get you to click the .jar files.
its annoying that my antivirus didnt pickup a threat in the .JAR file when there clearly is. No doubt its something to assist in extracting bitcoins or private keys or something.