PDF malware analysis — malicious · a41f0e79c7971894

MALICIOUS

PDF

36.4 KB Created: 2010-01-12 01:25:12 +03:00 Authoring application: dontForm (via 6dc4166c5aa3123f245a786381d0eb9c)

MD5: 2b3ccb459b2cb9d7b26e4145d52a4e20 SHA-1: 93e52286f34ddb156b957afe05a3a5e56193d64e SHA-256: a41f0e79c7971894d3afb8db7ec1e7759615f841ffa3308e864f092a6d74eb13

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript, specifically 'javascript_obj0024_001.js', is likely responsible for executing malicious code, potentially downloading a second-stage payload. The presence of obfuscated JavaScript and the ML score suggest a high likelihood of malicious intent.

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` `46aaa6f021cd012a991de4d6a7651187d13559a0dc1ee71f86eead2b1e496bcf`	pdf-javascript-stream	PDF /JS object 22 at offset 0x28CC	36618 bytes
`javascript_obj0024_001.js` `588ec6608676a7022def0caabf5ded0f9956163e64efd382639ef3d0a9b44737`	pdf-javascript-stream	PDF /JS object 24 at offset 0x8564	1735 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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