PDF malware analysis — malicious · 0b47a8b396eedd95

MALICIOUS

PDF

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

MD5: b707742bbf5e4b304cdcde437973bac8 SHA-1: 4da02d6471f12fb657d5cb062c992625a3d1931d SHA-256: 0b47a8b396eedd9525863747af25bf26059eede3cee6e3560739aa560e05eac0

268 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains obfuscated JavaScript that utilizes eval() calls, a common technique for executing malicious code. Heuristics indicate this is part of a known exploit cluster (PDF JavaScript exploit cluster). The script's primary function appears to be downloading and executing a second-stage payload, as suggested by the embedded JavaScript streams and the ClamAV detection signature 'Pdf.Exploit.Agent-36118'. The exploit is likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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` `1280479eb4e1dc06a6c4d4ec15bd3102ef588cd8b0a7bee5e740bff9076e45a5`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13541 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).
`javascript_obj0013_001.js` `b6460614f033ce1d681b7f79da97d56afbe015b103e918aad3bf21bc33ec7be1`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	14247 bytes
Detection ClamAV: Pdf.Exploit.Agent-36118 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).

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