PDF malware analysis — malicious · 42c24209df0edb6b

MALICIOUS

PDF

77.3 KB Created: 2009-12-05 19:48:35 Authoring application: PDF Library 1.3.5 (via PDF Library 10.8.5)

MD5: b935ed34dee1ffb1c78a9ac65e0d8bde SHA-1: c3811bb7450ee4e1cb67eaa7c18c6596548e98a0 SHA-256: 42c24209df0edb6b112259bdbe48c09ac2edf5ddafb4f450cc7f5fdfef9fe4e1

338 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, indicating it's designed to deliver a second-stage payload. The embedded and deobfuscated JavaScript, 'legacy_pdfkit_stage_000.js', likely facilitates this payload delivery, as suggested by ClamAV detections on extracted artifacts. The attack pattern is consistent with exploit kit delivery mechanisms.

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` `3b88b10479c833122b297ccba8b258fcbd5104a355e4313ecabf745d02037165`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	39089 bytes
`legacy_pdfkit_stage_000.js` `c9ea388f788b032b3a7fceaa13fc0f65da4d2d520f374efb77e32d27a9c37259`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x1A5	10120 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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