PDF malware analysis — malicious · 60051aa471a5ef7e

MALICIOUS

PDF

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

MD5: 99062359d35aad093b77003c1f8c2eb8 SHA-1: 8ea1741a36d7c794f3163da2708ef443be3c7534 SHA-256: 60051aa471a5ef7ea99be8633de816ced38221a8526f74705c1bba4ff71bc25f

268 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a PDF file that contains obfuscated JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics, and a critical PDF_JS_EXPLOIT_CLUSTER finding. The JavaScript uses eval() calls to execute malicious code, which is designed to download and execute a second-stage payload. ClamAV detections confirm the malicious nature of the file, identifying it as Pdf.Exploit.Agent-36118.

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` `07ffaa8d26aad87b88e16a487f49856396a54b40b3680942bab709621e0f92ba`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13289 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `bd11190c26561977f165ad0583c93ca6f65bdbf0e5bf488abcdefdd164e057a9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	13995 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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