PDF malware analysis — malicious · 51eb8069c39c44e9

MALICIOUS

PDF

14.7 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 0be23bcc29b887c04ef346936366133e SHA-1: 2665b3a0f26c71775336e87e013986096f3efcd7 SHA-256: 51eb8069c39c44e939a726055d659729779acca664d157fc19c24597e1825e95

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was detected as malicious by ClamAV (Pdf.Exploit.Agent-36118) and a machine learning classifier. It contains embedded JavaScript with multiple obfuscation techniques, including the use of eval() and string concatenation. The script likely attempts to download and execute a second-stage payload, as indicated by the high heuristic scores for PDF_EVAL and ML_NYX_PDF_MALICIOUS. The extracted JavaScript files, javascript_obj0013_000.js and javascript_obj0013_001.js, are the primary artifacts associated with this malicious behavior.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-36118 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36118
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `a07554b2438fe7e9f758242ffe50e08b382945b1cb468e19d2619ee7ed5c15cf`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13499 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 8 long base64-like blob(s).
`javascript_obj0013_001.js` `f127757118670f48de0894f739b5d25f27a0a01f9659a96ca0602b938a616db7`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	14205 bytes
Detection ClamAV: Pdf.Exploit.Agent-36118 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 8 long base64-like blob(s).

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