Currently underway is a malicious spam run with various subjects, for example:
Senders are random, and there is no body text. In all cases there is a PDF attached named nm.pdf with an MD5 of D4690177C76B5E86FBD9D6B8E8EE23ED or 6B305C5B59C235122FD8049B1C4C794D (and possibly more). Detection rates at VirusTotal are moderate  .
The PDF file contains an
Article Link: http://blog.dynamoo.com/2017/05/malware-spam-with-nmpdf-attachment.html