Obfuscation using arguments.callee() in java scripts is widely seen in browser exploitation and malicious PDF attacks. This kind of obfuscation could be a bit tricky to handle for security analyst. The arguments.callee() call is used normally to prevent security analyst from modifying the malicious function. The variable that holds the arguments.callee will be validated in […]
/Info does give an info :)
Common PDF dictionary used inside malicious PDF are /Author, /Producer, /Title, and /Subject which use reference from this.info.author, this.info.producer, this.info.title, and this.info.subject respectively. The PDF dictionary mentioned above are located inside the /Info referenced object. This can be identified from the reference variable above (e.g: this.info.title) used inside JavaScript code. For instance; this /* means […]
Observation of Common String Obfuscation Trick
String obfuscation has become an enemy of string/pattern matching since forever. With string obfuscation tricks, string/pattern matching with no proper handling will surely return no significant results. This kind of tricks has to be taken into consideration when developing a security tool with string/pattern matching as its one of the main engine. In this post, […]