Emotet has resurfaced after a five-month hiatus, with 250,000 malspam messages being sent to email recipients worldwide. Malware first emerged in 2014, but has since evolved into a full fledged botnet that s designed to steal account credentials and download further malware. The spam emails contain either a URL or an attachment, and purport to be sending a document in reply to existing email threads. The malicious URLs are now being distributed in PDFs and malicious URLs in email body.
Source: https://threatpost.com/emotet-returns-in-malspam-attacks-dropping-trickbot-qakbot/157604/