Mind that even an original updated antivirus may not detect some Trojan programs and malware which are usually introduced to cracked apps, like Adobe Illustrator CS5 Portable. You may use the best free antivirus programs to protect your computer but still, it’s not a guarantee that your software and data will be safe. Accordingly, when hackers change the source code, these protective functions may be deactivated and a program may be infected with computer worms, Trojans, and other malware. As a rule, it infects the user’s computer while installation and causes failures and system crashes. Like any other hacked app, Illustrator CS5 Portable might contain a virus which will harm your PC.