PDF malware analysis — malicious · 7629c80e52a57f73

MALICIOUS

PDF

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

MD5: 87633a6665da2a91841b283bfc1a701f SHA-1: 0b625bdf7898f448b41e553aeae961d5cf997373 SHA-256: 7629c80e52a57f737d6ce5a3d5d1469f8d794ac4de9388ecd5d1d27d7eaa291f

268 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes eval() to execute obfuscated code. This JavaScript is designed to exploit a known PDF vulnerability, as indicated by the 'PDF_JS_EXPLOIT_CLUSTER' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection 'Pdf.Exploit.Agent-36118' further confirms its malicious nature. The script's primary function appears to be downloading and executing a secondary payload, though the exact URL is obfuscated.

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` `be9baf3aa30fc6a4c585068ed2712d3c77224d7155674ba5b3646e64fcd38e23`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	13511 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj0013_001.js` `ea9a1d8174c87b3ecdf040b713847d4880cdb9fa473b85413cf1ef667261455a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	14217 bytes
Detection ClamAV: Pdf.Exploit.Agent-36118 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).

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