For these cases there is Secunia PSI -
http://secunia.com/PSISetup.exeThis program can be used to regularly check on your third party software, e.g. adobe, to see whether you have the latest version and all patches,
Could be via an iframe in the html loading the .pdf file or even allowing the javascripts and Mime and activeX for the sites will allow the silent download of a .pdf file.
Things to do besides disabling the mime, vbs, activeX and javascripts for global surfing, use Firefox browser with NoScript installed.
And disabling the use of iframes inside of the browser itself. This can be done in the Internet Explorer for just the Internet Security Zones in either the Tools of the IE or the Internet Options in the Control Panel or easily within the Opera browser( see
http://www.aimwell.org/Help/Buttons/buttons.html for the "iframe checkbox" for use on the Opera's toolbar).
Also make sure Windows is fully patched and updated with all ServicePacks installed.
After Adobe has been updated, please disable the use of Javascripts inside of the Adobe as an extra measure.
Files located in the Temporary Internet Files folder can be deleted by the history of the Internet Options or by a cleaner such as CCleaner, ATFCleaner, ClearProg.
If anything else please post a HijackThisLog.txt as an attached txt.file to your next posting,
you can install HJT from here:
http://www.filehippo.com/download_hijackthis/download/58170ee6e58bba306c943f5b6d745c99/polonus