PDF malware analysis — malicious · c346b91f74af9c95

MALICIOUS

PDF

7.1 KB Created: 2009-09-11 19:46:58 Authoring application: Eblasha 8.8.5.4 (via PDF Library 10.8.1.8)

MD5: c8320733fac0060073a54c17a77d0ebd SHA-1: 264ad76704a9d4e9cf1cf78ad278a0e13a09f5c8 SHA-256: c346b91f74af9c95d835a71b0f5e8afa86c7de748a52522ed91b36dbb4b8b0cc

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF was flagged by ML classifiers and ClamAV as malicious (Pdf.Dropper.Agent-1828907). It contains embedded JavaScript, including an eval() call and fromCharCode usage, indicating obfuscation. This script is likely responsible for downloading and executing a second-stage payload, a common dropper behavior.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Dropper.Agent-1828907 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828907
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. (matched inside decoded stream)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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_obj0013_000.js` `8cb1b529f8fd70a3aae351745f2bb8f6467ece90e5888d86f48f2864ce925988`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21463 bytes
`javascript_obj0015_001.js` `0eb431c920a0cef6e14256c95de618ee2738cb2df802f564868fd78d37f5ebb1`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1864	190 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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