Malware spam with "nm.pdf" attachment

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 [1] [2].

The PDF file contains an

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