PDF malware analysis — malicious · 3668a54374f096d3

MALICIOUS

PDF

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

MD5: 0c82bd1f94bb37a44840ef594e326ff0 SHA-1: f38171abfb5c50f64f1951b4e62d00b3ec248145 SHA-256: 3668a54374f096d3cc8ca5d6a826900ceadb476c3d9d4d8f0d357e87a66bd32b

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript with multiple eval() calls, indicating obfuscation. Static analysis heuristics and a high ML classifier score confirm malicious intent. The JavaScript is designed to execute arbitrary code, likely downloading and running a second-stage payload. The specific obfuscated JavaScript string is: 'KMIzk5QfiTYwG=Math.ceil(o4El9NmRvd3tD/qaaQasHAK3K eval(bbdm8=Math.min(o4El9NmRvd3tD,qaaQasHAK3K 'p1NKcGIq|=(KCqct['aUzHol.charCodeAt(HDWkL4ahLZRQ18+ Rg6kscbUj '=String['fromCharCode'](205^p1NKcGIq&255 tqc8jtH4vb')'.

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` `1257c45cc63fe09c0f4a1306da410adc1d27714c2c357aa83c824df770eec35f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D9	5330 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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