This phish has variations, but the common thing is to click to get a document, a voicemail, etc. The one circulating today pretends you received a fax (somewhere?!) and it is one click away. What happens actually when you click is that a browser window opens and a .jar file downloads automatically.  Jar files are Java programs, and this one is a malicious one. Once downloaded, there is a chance you click on it, the program executes and your computer gets infected.
Please report such phish, do not be curious and do not click on the buttons.