PDF malware analysis — malicious · 7ace6e419da3aff1

MALICIOUS

PDF

36.9 KB Created: 2009-12-25 12:46:28 +03:00 Authoring application: dontForm (via d97dfe4d6bab44f304da189cdcb5bc74)

MD5: ae33225cc44a7ac84aff95fa95636052 SHA-1: 6ea9316c7c1ad26eb3e0c69aecd630a24b944405 SHA-256: 7ace6e419da3aff13c9615b688b31025129478dd0e9165545779bdd439d7543c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of obfuscated JavaScript streams, specifically 'javascript_obj0024_001.js', points towards an attempt to hide malicious code execution, likely to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

Heuristics 6

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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.
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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_obj0022_000.js` `09ad960ff1df2e24a633fc210e46cd0369aa1ad5ec833445fafba1c6d64a8d83`	pdf-javascript-stream	PDF /JS object 22 at offset 0x2883	37233 bytes
`javascript_obj0024_001.js` `7408e7832535076c880c08ff1378a0686ee317941cd4aeff490ae7f3699b12da`	pdf-javascript-stream	PDF /JS object 24 at offset 0x86E9	1816 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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