PDF malware analysis — malicious · ef7b806784704028

MALICIOUS

PDF

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

MD5: 3189b98b97b13c66c6d9864e90aedd95 SHA-1: f3cc0f0ea4e58ba26e0c92abe682ba9cf2a5be0e SHA-256: ef7b8067847040283a7c08ce2ae50eda11d46e7d55bec4fdf2f3dc05ff0af2e7

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF sample was flagged as malicious by ClamAV (Pdf.Exploit.Agent-35587) and an ML classifier. It contains embedded JavaScript with multiple eval() calls, indicating obfuscation. The script likely downloads and executes a second-stage payload, as suggested by the 'ML_NYX_PDF_MALICIOUS' heuristic and the presence of an extracted JavaScript file. The obfuscated JavaScript string 'Math.ceil(l0moTby/jCGtZ4VifXp4q' is part of the execution chain.

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` `149216f501a2a71be2d3813d56a4df5abedf15075e1593473e1522a7b65a124d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x392	5959 bytes
Detection ClamAV: Pdf.Exploit.Agent-35587 Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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