PDF malware analysis — malicious · c8fbd03e39e10943

MALICIOUS

PDF

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

MD5: f1a50e1b2aa18e4d049f53d43472eef9 SHA-1: bf2aefdfa26c14b834818433bfe617711a1c8da3 SHA-256: c8fbd03e39e10943faf33e35d60a7d638dfbd6de9a6b4bcfc99b353f88c51814

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV (Pdf.Exploit.Agent-35587) and a machine learning classifier. It contains embedded JavaScript with heavy obfuscation, including concatenated strings and eval() calls, which are used to execute malicious code. The primary intent appears to be exploiting vulnerabilities within the PDF reader to download and execute a secondary payload, as indicated by the ML_NYX_PDF_MALICIOUS heuristic and the presence of an embedded JavaScript file.

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` `f43596e62158e9426b40b0237b22cff601961255e8f52663ca266cd42ba4e384`	pdf-javascript-stream	PDF /JS object 13 at offset 0x389	5965 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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