Social Engineering Attack Against Adobe Reader (Apr 01, 2010)
Social engineering is the act of manipulating people into performing actions or divulging confidential information, rather than by breaking in or using technical hacking techniques.
Didier Stevens recently demonstrated how to use social engineering techniques to entice end user and execute arbitrary code in Adobe Reader. The original blog post can be found here. Given the popularity of Adobe Reader, it is a great example showing how social engineering attacks can affect our daily lives. Adobe Reader does not allow embedded executables to be extracted and executed directly. To bypassed the restriction, the first thing (in Windows) to do is running cmd.exe. This can be achieved by calling (/Launch /Action). The only thing preventing cmd.exe from execution is a dialog box:
Using social engineering techniques, the author replaced the warning message to this:
Once the targeted user clicks the “Open” button, the cmd.exe will be launched. At this point it is up to the PDF author’s creativity to perform additional malicious actions, as cmd.exe can be used to run embedded executables in the PDF file.
SonicWALL has released an IPS signature to detect and block PDF files utilizing launch action. The signature is listed below:
- 4907 Suspicious Launch Action in PDF Document
Please note since usage of launch action is legitimate and defined in PDF specs, the signature is set to low priority.
The SonicWall Capture Labs Threat Research Team gathers, analyzes and vets cross-vector threat information from the SonicWall Capture Threat network, consisting of global devices and resources, including more than 1 million security sensors in nearly 200 countries and territories. The research team identifies, analyzes, and mitigates critical vulnerabilities and malware daily through in-depth research, which drives protection for all SonicWall customers. In addition to safeguarding networks globally, the research team supports the larger threat intelligence community by releasing weekly deep technical analyses of the most critical threats to small businesses, providing critical knowledge that defenders need to protect their networks.
