PDF malware analysis — malicious · 8af9ac9d570f84b6

MALICIOUS

PDF

75.9 KB Created: 2009-12-09 19:49:66 Authoring application: PDF Library 5.1.2 (via PDF Library 9.3.9)

MD5: 261dcc4d9a2145641f8ac433dd886332 SHA-1: 263e45c658de3e832d550b4bdb5cf284579a7b42 SHA-256: 8af9ac9d570f84b6398e9f8723174d49b2fb4166c816c3f7d8cdd187a21b8303

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains multiple critical heuristic firings indicating exploitation of known Adobe Reader vulnerabilities, specifically CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. These exploits target embedded JavaScript, which was found in a deobfuscated stream named 'legacy_pdfkit_stage_000.js'. The script is likely designed to download and execute a second-stage payload, as indicated by the ClamAV detection on the extracted artifact. The presence of multiple exploit triggers and the deobfuscated script strongly suggest a malicious intent to compromise the user's system.

Heuristics 9

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)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
ClamAV: Pdf.Exploit.Agent-36110 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36110
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.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0007_000.js` `1830d89754f6062db98de16877e44a618d5f310cb794a9be3622d8f9ebe472e4`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	38345 bytes
`legacy_pdfkit_stage_000.js` `72f0ac7769f7a6f00bfe829d3bf3a3ca913628902b63ec9f3df748205f7d324c`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x1A5	10024 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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