PDF malware analysis — malicious · 8e02258f452b8bb5

MALICIOUS

PDF

17.3 KB Created: 2009-07-11 14:57:48 Authoring application: AYDSe0F (via e0ZFXFo3NkdyLZ)

MD5: 24eff58eec0f83dc82656ab22c13aec3 SHA-1: f5f8e6e3ca62ed1e0a6009f5325b3cc283248b32 SHA-256: 8e02258f452b8bb56dd5f2bc54fb420e4ab6a6447c50471081ff2f373db9b552

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains obfuscated JavaScript that leverages multiple Adobe Reader vulnerabilities, specifically CVE-2007-5659 and CVE-2008-2992. The JavaScript is heavily encoded and uses a custom Base64 decoder, ultimately executing an exploit stage. This stage is designed to download and execute a second-stage payload, as indicated by the 'Js.Trojan.Obfus-48' ClamAV detection and the ML classifier's high confidence score. The exploit kit structure points towards a downloader or dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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)
Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT

One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
ClamAV: Js.Trojan.Obfus-48 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Trojan.Obfus-48
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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` `6c52f9e3497719b3cc386807838b23c3e513a7ea672a9f5883db66aa0932f080`	pdf-javascript-stream	PDF /JS object 7 at offset 0x241	16410 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`custom_b64_stage_000.js` `7cb87e1a7984422a9af66f646dbe2bf051fd719d1007f9601cee7dd319dbd3fe`	deobfuscated-js	custom Base64 decoded JavaScript layer 3 (PDF /JS object 7) at offset 0x1176	4552 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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