PDF malware analysis — malicious · 85b5397f2a8812c7

MALICIOUS

PDF

11.9 KB Created: 2009-11-25 19:41:98 Authoring application: PDF Library 6.4.5 (via PDF Library 4.6.5)

MD5: 7cdb06843a9e6d473fea620a3be1c458 SHA-1: 5246af13bf81776d5b77e696bcbc4b8d6bab212d SHA-256: 85b5397f2a8812c7c6d37d833bf79b3a73b00a62abd9902834ab0c3b8269ddc1

278 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF exploits multiple known vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 by leveraging embedded JavaScript. The embedded JavaScript, identified as legacy_pdfkit_stage_000.js, is heavily obfuscated but static analysis indicates it likely downloads and executes a second-stage payload. ClamAV detection on an extracted artifact (Js.Exploit.Shellcode-18) further supports the malicious nature of the embedded script.

Heuristics 8

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 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` `7234fb8b81476ae29aff3e03ec57e0575ecfad69c47b2db56b8ecc8da34455f0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	37821 bytes
`legacy_pdfkit_stage_000.js` `dc3a304377f4f56260c8bdd77534408e92536f9c92f6099fc2de5b72b9ec0476`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x268	9880 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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