Jaff is relatively new ransomware that’s being distributed with the help of ” that currently controls over 6 million infected computers worldwide. The Jaff attack started on May 12 the same day when the devastating WannaCry ransomware debuted by sending spam emails at the speed of 5 Million emails per hour. Once victims download and enable a Word macro associated with the PDF, the Jaff ransomware gets downloaded onto their computer, encrypting victims files and then demanding a ransom of between 0.5 to 2 Bitcoin ($1,500 to $5,000)
Source: https://thehackernews.com/2017/06/jaff-ransomware-decryption-tool.html