PDF malware analysis — malicious · eac220b092df3d22

MALICIOUS

PDF

8.9 KB Created: 2009-06-16 23:27:33 Authoring application: TLebjdLBqbXn (via pFvEpZUuYzeNpGOanlzuK)

MD5: f9e6e4c29213faa2b9876f34221b8731 SHA-1: 4094eff79445625b8adff008f4c926b0b9ad4905 SHA-256: eac220b092df3d22c13f0a22c374ffc52e4a3f38d448985721c81ac98b69235a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by ClamAV as Pdf.Exploit.Agent-35591 and exhibited multiple JavaScript-related heuristics, including embedded JS streams and the use of eval(). A machine learning classifier also assigned a high probability of maliciousness. The embedded JavaScript, though obfuscated, likely contains code to download and execute a second-stage payload, which is a common technique for initial access or further compromise. The document body text does not provide specific lures but contains repetitive, seemingly random phrases.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-35591 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35591
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` `a4a66cebd74a140a62d709d99555e37507b5a05d8c3aaa29b1acb259a826afa6`	pdf-javascript-stream	PDF /JS object 7 at offset 0x4B0	5931 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `eddd6a2ea5f7167d90c8bd76609b8a28b8f8385a36b439914f5d700188e3d64a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x4B0	2535 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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