PDF malware analysis — malicious · 4b22a4c81119af1a

MALICIOUS

PDF

34.2 KB Created: 2009-09-06 16:34:18 Authoring application: hpjMcWCeoelucvjFmKj (via bfxYrkwhXfIHzCmR)

MD5: f39ce79397e4c5b0aa647a669115ddd9 SHA-1: 7b1ad430331f712fdc8c70d8726da86b43ed8c60 SHA-256: 4b22a4c81119af1ada173893b7c7cc0796da1c08a2a3ba268addde753dbed2ba

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically a dropper. The presence of JavaScript and the 'dropper' classification imply the script is designed to download and execute a second-stage payload. The file is classified as malicious by ClamAV as Pdf.Dropper.Agent-6290507-0.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

ClamAV: Pdf.Dropper.Agent-6290507-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-6290507-0
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0023_000.js` `e3b07a95f2236e94862f93307c7157c394fc1785871910d479b6157ecba85663`	pdf-javascript-stream	PDF /JS object 23 at offset 0x490B	15141 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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