PDF malware analysis — malicious · 4847c2a2f057788e

MALICIOUS

PDF

6.6 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 1907f7afa74717cffb02f93c8c3ab38a SHA-1: 041c2ec3f25d6fc3bb762c72620c16587f3be36f SHA-256: 4847c2a2f057788e097398ce186d4af3a1f652624527f7219d90254779bba001

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The file is a PDF containing embedded JavaScript, flagged by multiple heuristics including ClamAV detection as 'Pdf.Exploit.Agent-35587'. The JavaScript stream contains obfuscated code utilizing `eval()` and string concatenation to construct and execute commands. Specifically, it reconstructs the string 'fromCharCode' using character codes and bitwise operations, indicating an attempt to dynamically generate and run malicious code. This behavior is consistent with a PDF exploit designed to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-35587 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35587
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `e2ea7be9ec8c9d4ee058b3945948a66059c3da97ba6c3a59b08708ab9d3e51e2`	pdf-javascript-stream	PDF /JS object 13 at offset 0x38F	5255 bytes
Detection ClamAV: Pdf.Exploit.Agent-35587 Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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