PDF malware analysis — malicious · 40f32511723797be

MALICIOUS

PDF

6.9 KB Created: 2009-09-24 19:48:73 Authoring application: Eblasha 3.10.2.5 (via PDF Library 5.9.5.2)

MD5: 230748c2bd16ba0213b73f0fd045169d SHA-1: 3b9f9b6df8cb0b7d717f80ee3c80c937b42964c0 SHA-256: 40f32511723797be469f3164b12efe3da97a1bcf680cf3ceee6d0b5c2022b299

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by ClamAV (Pdf.Dropper.Agent-1828731) and a machine learning classifier. Static analysis revealed embedded JavaScript with eval() calls and fromCharCode usage, indicating obfuscated code execution. The presence of extracted JavaScript artifacts further supports the conclusion that this PDF is a dropper, intended to download and execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Dropper.Agent-1828731 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828731
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` `69724c67ed823f61d4f20a872720a66fe18da82f1af07ed962794e7b18c9af6c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21173 bytes
`javascript_obj0015_001.js` `fc940323f0ddf3607c57f6dbb1d0984c627c9cdf8974364c1cea51a4e0611c97`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1786	196 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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