PDF malware analysis — malicious · b116719857a0ef42

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: 0a4ee37d3660af5eac9e85357b4ee01b SHA-1: 3a6907834e39abd91f78a053b146bc161325ecb0 SHA-256: b116719857a0ef42b0042a34a6a63725ff4ac4430627890a3c1667765ae763c8

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() calls, a common technique for obfuscating malicious code. Heuristics indicate this is a known exploit (Pdf.Exploit.Agent-36118), and the ML classifier strongly flags it as malicious. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the presence of extracted JavaScript files and the exploit detection.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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` `bba22ec3c613bc38daccf10509f80740296073d9c20dcb436390a9829ee49f9e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13224 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
`javascript_obj0013_001.js` `fa2edefe3f65665768e9758db87102e16049647668e7a039e706daff5d59aba2`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	13930 bytes
Detection ClamAV: Pdf.Exploit.Agent-36118 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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