PDF malware analysis — malicious · 0f1449bdeacb78e8

MALICIOUS

PDF

9.0 KB Created: 2009-07-08 14:21:08 Authoring application: jkUUGFHfdMwNI (via BoUJOVuoQwypTaA)

MD5: 49e1d58e974e1a9d888134c63f50ecdd SHA-1: 9bc5c6fbcec89e7f9dd7f271a89b14e064c3c206 SHA-256: 0f1449bdeacb78e8ae57f1d34f10c36787ee3f47ec228fdb31cb989057ff0f2c

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that is heavily obfuscated, indicating an attempt to hide malicious activity. Heuristics and ML classifiers strongly suggest this PDF is malicious, with ClamAV identifying it as 'Pdf.Dropper.Agent-7229190-0'. The JavaScript likely downloads and executes a second-stage payload, a common technique for dropper malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Dropper.Agent-7229190-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7229190-0
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` `b0b8b93f6a57f59aa32ab40d321d19d74f9d5ebe862d3d4c83f70e52411f9731`	pdf-javascript-stream	PDF /JS object 7 at offset 0x3F6	7473 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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