Poor explanation = scaremongering
"The potentially sensitive data is included in PDFs that have been printed using Internet Explorer."
The explanation in this article is so poor I had to go to the linked site because I couldn't see how printing a pdf could possibly add anything to it. The information is not included in pdfs that have been printed with IE, it is included in web pages that have been converted to pdfs using a pdf printer driver from IE. That's very different to the explanation given in the article.
The number of pdfs that are created by printing a web page will be much lower than the number of pdf that have been printed while viewing them in IE. The poor explanation given will cause a lot more people to think they are at risk of exposing info than actually are. Is this CNet or El Reg?