PDF malware analysis — malicious · be162a14bc91b9bc

MALICIOUS

PDF

7.9 KB Created: 2009-09-11 19:49:32 Authoring application: Eblasha 8.1.8.8 (via PDF Library 6.8.8.2)

MD5: ec227db928d4433d5c977c9fa51c24a3 SHA-1: 2f7dd9da0339c40e88ca9c9d514b1050c5ad2c9c SHA-256: be162a14bc91b9bc50a0eb4fc39d11ad3fd37af1bfd7c0f8a9ecb37ad8d03e65

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by ML classifiers and ClamAV, specifically identified as Pdf.Dropper.Agent-1828922. It contains embedded JavaScript with eval() calls and String.fromCharCode usage, indicating obfuscated code execution. The primary function appears to be downloading and executing a secondary payload, typical of a dropper malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Dropper.Agent-1828922 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828922
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` `4a002cc8f44bda584e74bd935827c0cd11522694d9f9e607b6baed78becd00bf`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21291 bytes
`javascript_obj0015_001.js` `bc45efb3d7d6944f11ea60be538f3beaa7484c389bad07dfdd7127b06d8b726e`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1BA3	184 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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