PDF malware analysis — malicious · 3811adbc37c5d725

MALICIOUS

PDF

9.2 KB Created: 2010-02-02 17:51:19 Authoring application: mOpUjCscMqwEbFxeWdKrI (via ZUPYDEtgUPioqiL)

MD5: 6c932e52a94f604a6987692438a16cd8 SHA-1: eccd7ac71c1f460a21bacd6ccf6baacf5ee93ffc SHA-256: 3811adbc37c5d7250d4474bb5de2c57e92bf5d056ea5a36b89d09817f1638ab9

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious (Pdf.Exploit.Agent-35572). It contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics, and uses String.fromCharCode, suggesting obfuscation. The ML classifier's high confidence score and the specific ClamAV detection strongly indicate an exploit is present, likely leveraging the embedded JavaScript to deliver a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Agent-35572 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35572
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_obj0007_000.js` `8b241635e76866847f88876ee1d4a2bd18e77182ac7e48c0253a0f1c9841ba0a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x2E1	7886 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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