PDF malware analysis — malicious · 863b8d160b8501f4

MALICIOUS

PDF

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

MD5: 3f3ae842705e53bfeb2f537850e6f2ae SHA-1: b3d96e5dc14f0ab4f1b698bc3dc8810aaf8c7342 SHA-256: 863b8d160b8501f42987b5f5cc0a4017ac816c0135930984f089848762ce36a1

268 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is heavily obfuscated and uses eval() calls, indicating malicious intent. Heuristics and ClamAV detection confirm this is a known exploit (Pdf.Exploit.Agent-36118). The JavaScript likely serves to download and execute a secondary payload, a common technique for initial compromise.

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` `a206f38810a22e3df9b45212fc517aafeecbffa780c9165fe8bee11891289ffb`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13361 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj0013_001.js` `63f001787f6ce426aa2a8261b93f601d8a75050bde7ce7b64cc11ee1dcf1ea0a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	14067 bytes
Detection ClamAV: Pdf.Exploit.Agent-36118 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).

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