Pdf.Dropper.Agent-5343081-0 PDF malware analysis — malicious · 9e4298c9c4a2247a

MALICIOUS

PDF

9.9 KB Created: 2009-10-04 13:45:55 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: beff229c10eacff5b6189b3f9f29fa84 SHA-1: 0ccc52a18b907d15ad3583298e477937d5c05765 SHA-256: 9e4298c9c4a2247a91e4e1505834f9fb28571993968b2ec38073abea069a6656

156 Risk Score

Malware Insights

Pdf.Dropper.Agent-5343081-0 · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The JavaScript stream, decoded using unescape() and String.fromCharCode, likely functions as a dropper, downloading and executing a second-stage payload. The extracted artifact 'javascript_obj0013_001.js' further supports this. The attack pattern is consistent with a malicious PDF dropper.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-5343081-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-5343081-0
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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. (matched inside decoded stream)
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_obj0013_001.js` `e62068c9751a05a98e799187152431af63d5b423a40693fab64c136852e3e601`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	12861 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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