According to Kasperksy Labs: "The corona virus, which is currently hotly debated in the media, has been used as a bait by cyber-criminals.

So far, we’ve only identified ten unique files, but since this type of activity is common to popular media topics, we expect this number to increase. As people continue to worry about their health, fake documents that are said to educate them about the corona virus may be spreading more and more malware.“

The BOTTOM LINE
DON'T Download, Click-On or OPEN any attachment received in unsolicited, unexpected, unknown-sender emails...including .pdf, .mp4, .docx, or really anything else...

AND make sure you have an "off-line" backup of all your files that you regularly update."