This is one of the the first anti virus, malware detector released for iOS till now. This will scan your iOS device or a particular file as you want.

The application in App Store is described as follow

Your iPhone, iPad or iPod touch is a new vector for bringing files into your home or business network. While there is no known malware for iOS, files can flow through your device into your computers at home and at work, by e-mail, or via remote locations such as MobileMe or Dropbox. Mac and Windows viruses, malware and worms will take any path they can to get into your home and work computers, and can easily be passed on to friends and co-workers directly from your iOS device.”

VirusBarrier iOS lets you easily scan e-mail attachments, other files you have access to on your iOS device, or files on remote locations such as MobileMe and DropBox, web servers or WebDAV shares. VirusBarrier iOS uses Intego’s award-winning VirusBarrier X6 scanning technology to detect and eradicate all known malware affecting Windows or Macs: viruses, worms, Trojan horses, fake antiviruses, and other types of malware that might otherwise pass through undetected.

This application obviously is not free and is for $2.99 and €2.39.