PDF malware analysis — malicious · 74f636bad3adefc3

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: d0383882bf982b0a5d04553055ad0963 SHA-1: 72252ecf4841e97d7e1d0d94acab7eac11aeefd6 SHA-256: 74f636bad3adefc30643f5d4ec871dc1e91ebf3d8df75c8496f0f9d6f85df7a2

268 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that utilizes eval() calls and string concatenation to obfuscate its actions. The primary function appears to be downloading and executing a secondary payload, as indicated by the 'PDF JavaScript exploit cluster' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection 'Pdf.Exploit.Agent-36118' further confirms its malicious nature, suggesting it's a known exploit targeting PDF vulnerabilities.

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` `6f4e69d8fc95d7f9b2c56c01f4d5a8a124dbf58bee2d74f0a8679540d1a44bae`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13443 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` `c9fd7c8a4f79adb9a5d1b3b70b4fc2d3f970167838368c05a16081497c1cbeb7`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	14149 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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