how serious is this? what companies are affected? we got a big alert. >> it's serious in terms of the entities involved. we talk about email alerts at news corporation. disney, coca-cola, wells fargo, comcast, the world's largest cable provider had to shut down their systems to deal with it. when you clicked on the pdf file it inserted malicious software into your computer and isn't it to every single contact you had, that's how it proliferated and spread oh quickly. megyn: i have gotten email from friends that are not from them. if you get one of these, does it still read here you have -- and it has a pdf file?