About ten percent of Web pages contain malicious code, according to a Google study. The company analyzed 4.5 million URLs and found that 450,000 were malicious and engaging in 'drive-by-downloads.' Another 700,000 sites were seen as suspect. A large fraction of Web surfers are exposed to malware daily, according to the study. "The victims are completely unaware of the ghost in their browsers and do not know that their key strokes and other confidential transaction are at risk from being observed by remote adversaries," it states.