PDF malware analysis — malicious · 15121de5ca478731

MALICIOUS

PDF

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

MD5: 5f1c7ebcb7fe0c0bc4507a63b42fa729 SHA-1: 8f6139f85a5e571705087a6f130b22f0c043ffec SHA-256: 15121de5ca4787317b34d3a8bb91c1a0a7b4cf0c2574fe88dbc860e2bb7cf6ab

268 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains heavily obfuscated JavaScript, including multiple eval() calls, which is a strong indicator of malicious intent. ClamAV detections and ML classifiers also flag this file as malicious, specifically identifying it as a PDF exploit. The JavaScript is designed to execute arbitrary code, likely to download and run a secondary payload.

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` `f989377f561d41c9ade7434585440e662f9f6cff068c0daac289cbab3740e930`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13208 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 10 long base64-like blob(s).
`javascript_obj0013_001.js` `5ca8906dc99ace274f8b7b0d281d8f54ee8b215255b142474caf180e0b4ca4c3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	13914 bytes
Detection ClamAV: Pdf.Exploit.Agent-36118 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 10 long base64-like blob(s).

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