PDF malware analysis — malicious · 4546b0938925d0fb

MALICIOUS

PDF

11.6 KB Created: 2009-02-19 14:45:49 -02:00 Authoring application: Writer (via OpenOffice.org 3.0)

MD5: 196fdf3e0c83da674f436ea3c59bea84 SHA-1: 97d523f0926d2ecd46bdf95ec25f823b4451fe38 SHA-256: 4546b0938925d0fb13820d13ab9883b7f0e4466993438222537b7567c3f32f88

228 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Exploit.Agent-35541, indicating a known exploit. High-severity heuristics detected embedded JavaScript with eval() and unescape() calls, and a launch action, suggesting the script is designed to execute malicious code. The presence of an embedded JavaScript file further supports this, likely serving as a downloader for a second-stage payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

ClamAV: Pdf.Exploit.Agent-35541 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35541
Launch action high PDF_LAUNCH

PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0027_000.js` `5775770fb7b3b15c997b3689943d9698c5a515d2618ec3a5452f6fcf32e32bb4`	pdf-javascript-stream	PDF /JS object 27 at offset 0x21C1	54738 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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