NEW ACTIVEXOBJECT ACROPDF PDF

Attracting more than a half-million annual readers, this is the security community's go-to destination for technical breakdowns of the latest threats, critical vulnerability disclosures and cutting-edge research. Many reports have indicated that malicious PDFs that exploit flaws in Adobe's Acrobat Reader are the top client-side attack vectors. As indicated in many news stories and backed up by the WASC WHID real-time reporting , planting of malware on websites is a major problem for web site owners. The last thing that they want to do is to serve malicious code to their clients. There are many different methods for adding malicious code to web applications including:. Speaking from first hand knowledge gained from monitoring web-based honeypots, I can attest to the drive-by downloading methodology used in a majority of these attacks.

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Attracting more than a half-million annual readers, this is the security community's go-to destination for technical breakdowns of the latest threats, critical vulnerability disclosures and cutting-edge research. Many reports have indicated that malicious PDFs that exploit flaws in Adobe's Acrobat Reader are the top client-side attack vectors.

As indicated in many news stories and backed up by the WASC WHID real-time reporting , planting of malware on websites is a major problem for web site owners.

The last thing that they want to do is to serve malicious code to their clients. There are many different methods for adding malicious code to web applications including:. Speaking from first hand knowledge gained from monitoring web-based honeypots, I can attest to the drive-by downloading methodology used in a majority of these attacks.

This takes you to the If your browser has the AcroPDF plugin, it will then be sent to the p. If you had not kept up with your Adobe Acrobat updates, or as it seems more and more frequently, if the badguys have 0-day PDF reader exploits, then your system will get pwned While these attack vectors are prevalent, another vector that is often used is to abuse an applications own file upload capability to plant malicious files on the site for other clients to download later.

Allowing clients to upload files to your web application can potentially cause big problems however many businesses require this functionality.

While it is certainly possible to attack the web application platform itself, the salient point to highlight in this blog post is the following section:. This means that the end goal of the attack is to use the web applications own file upload mechanism in order to spread malicious files to other clients. So, the question them becomes " How can we analyze these file attachments being uploaded in order to prevent any malicious ones from making into our web application?

Don't be fooled into thinking that this an easily solved question. Many business owners erroneously believe that you can use your standard AV software to scan the file. What they fail to grasp is the fact that AV software typically only scan OS leve files and these file attachments are usually transient in the HTTP transaction. They often traverse reverse proxy servers, load-balancers, etc OS level AV software scanning won't really help in this situation. ModSecurity's inspectFile operator provides the capability to extract out file attachments so that they can be examined by OS level validation tools.

Older versions of ModSecurity also include a perl script called modsec-clamscan. Keep in mind that you are not tied to using only clamAV. In this example we are going to show using the inspectFile operator in action. I then need to update the modsec-clamscan. Now, if a user uploads a malicious PDF file, such as the "pef. If we send a fie attachment request with the pef.

While clamAV is an adequate free open for AV scanning, the old adage holds true: You get what you pay for. PDF exploit development has advanced to such a degree that signature analysis along is not sufficient to identify malicious files. What is needed is a heuristic analysis of the PDF structure to identify malicious characteristics. It just so happens that one of my colleagues here on the Trustwave SpiderLabs Research Team, Rodrigo spookerlabs Montoro has developed a really cool method based on this concept and he will be presenting it at the upcoming Toorcon conference.

Check out his blog post that lists some rather surprisingly low detection rates for malicious PDFs from the AV software used with VirtualTotal. He created a script that checks various PDF structures and scores the components. So, if we want to apply this PDF analysis check against our uploaded files, we simply need to update the format of the script output for use with the ModSecurity inspectFile operator. We need to make sure that the the first character is a "1" if the file is not malicious and a "0" if it is malicious.

So as you can see, we can get more accurate results for identifying malicious PDF files uploaded vs. It will be released by Trustwave SpiderLabs at some point in the future. Keep in mind that the inspectFile operator is simply a type of API that will allow you to inspect file attachments. It is up to you to decide which type of program you would like to plug-in and use. This is a bot-free zone. Please check the box to let us know you're human. Download Now.

Read complimentary reports and insightful stories in the Trustwave Resource Center. Malicious Banner Ads - there have been stories where banner ad feeds were used to attack clients - WHID Hackers Push Malicious Ads onto UK Celebrity Gossip Website Speaking from first hand knowledge gained from monitoring web-based honeypots, I can attest to the drive-by downloading methodology used in a majority of these attacks.

Initial injection into the index. Malware Antiy-AVL 2. O Avast 4. MalwareFound Comodo O F-Secure 9. Gen Fortinet 4. Gen Ikarus T3. AG NOD32 NKB Norman 6. EP nProtect Gen Panda Generic Prevx 3. File Upload Abuse While these attack vectors are prevalent, another vector that is often used is to abuse an applications own file upload capability to plant malicious files on the site for other clients to download later.

While it is certainly possible to attack the web application platform itself, the salient point to highlight in this blog post is the following section: Attacks on other systems Upload.

After plugging in the new script to my SecRule, here is what I get when trying to upload this new malicious PDF that was missed by clamAV: [Tue Oct 05 ] [error] [client Recent SpiderLabs Blog Posts. Thank You One of our sales specialists will be in touch shortly.

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Adobe PDF Reader - control ActiveX Internet Explorer 11 fails with unspecified error.

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