PDF malware analysis — malicious · b4ec0f3999ddfef9

MALICIOUS

PDF

6.8 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: b24464ec7192014181d7b5b0fa6dbc3f SHA-1: ac548c369ac56888eb5401a65778f4cc98142b3c SHA-256: b4ec0f3999ddfef94032ddb3f4589982d4e456791366874db3b9636f9a9d99b1

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF contains embedded JavaScript with multiple eval() calls, indicating obfuscated code execution. ClamAV detection as 'Pdf.Exploit.Agent-35587' and a high ML classifier score confirm maliciousness. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, as suggested by the heuristic firings and the nature of the embedded script.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-35587 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35587
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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_obj0013_001.js` `fcec67ae7fbf824721199426c4eda6f41bb4751c41a6ad39625d2b885c90aaed`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D8	5320 bytes
Detection ClamAV: Pdf.Exploit.Agent-35587 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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