PDF malware analysis — malicious · 5d98a6f7b5291169

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: b7dca56e28e2fc66eff82d257efbbfb0 SHA-1: a43e9ddc44128e51602cdf2b35165c39a0e08efe SHA-256: 5d98a6f7b529116989d657dd32ac5248c37f6b33d6c3f1420e8dc72df48c9ae8

268 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF sample contains obfuscated JavaScript that utilizes eval() calls, a common technique for executing malicious code. The script appears to be designed to download and execute a second-stage payload, as indicated by the PDF_JS_EXPLOIT_CLUSTER and ML_NYX_PDF_MALICIOUS heuristics. The ClamAV detection of 'Pdf.Exploit.Agent-36118' further confirms its malicious nature.

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` `897ddaa060367a20d3b4248a9b80ec8b6fcfec152ad4add6e2f94a77192b43e3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13537 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `b3ca19ca9c0c2150ebcfa23d20bd2413eff345dc87e7f7625b72ff88eb5304bc`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	14243 bytes
Detection ClamAV: Pdf.Exploit.Agent-36118 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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