PDF malware analysis — malicious · 20ca19054ceaf04e

MALICIOUS

PDF

5.0 KB Created: 2010-02-12 06:36:46 Authoring application: yfc827bce1dfcc

MD5: 1c2a12b4db3980cc3436a3e190afd19b SHA-1: 61cd42fcb3de8ba4e374cdd5561bfb0266958422 SHA-256: 20ca19054ceaf04e242747ab7dd6dab3d10786c761d927541ea2168e80e3b3c3

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link T1071.001 Web Protocols

This PDF file contains embedded JavaScript that exploits multiple known vulnerabilities including CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. The heuristics indicate that the JavaScript is obfuscated and likely decodes to shellcode. ClamAV detected this as Js.Exploit.Shellcode-18, suggesting it's designed to download and execute a secondary payload. The extracted JavaScript file 'legacy_pdfkit_stage_000.js' is the deobfuscated stage.

Heuristics 7

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `0c45894f0b2ec9da0a94222511136202da294317da6ae169c2b4d44669e35866`	pdf-javascript-stream	PDF /JS object 4 at offset 0x1047	690 bytes
`legacy_pdfkit_stage_000.js` `4f55240fb5a3403ebc8cbcfc0cbea9fb769eed54d1d9eb67c346d04db5e94efd`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x310	5761 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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