Yes, it is a hacking attempt.
I got this message from 5 different “customers” today. Exact same text, none of them are real customers.
The js files contain some obfuscated WScript code which basically attempts to download a malicious file and execute it on your system.
Stay away from it and you should be fine.
P.S. If anyone cares to investigate further, the executable is being downloaded from: [link removed]