PDF malware analysis — malicious · 6f6b78b713479cd5

MALICIOUS

PDF

3.0 KB Created: 2008-08-03 07:51:49 -09:03 Authoring application: Adobe InDesign CS3 (5.0) (via Adobe PDF Library 8.1)

MD5: 444afc116202c57cb26a8ceeec6d8a06 SHA-1: 29e6b9ab1973d023962b83ff7109d655db69aaeb SHA-256: 6f6b78b713479cd528482bb8e4b45453e6e9340276cc1ad1577531522eaa33de

150 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains obfuscated JavaScript that, when decoded, reveals a URL pointing to an executable file. This script is designed to download and execute a second-stage payload, likely a malware dropper. The ML classifier and exploit cluster heuristics strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://67.215.246.138/a92/aff_9.exe?u=i/8/0&spl=p1

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `a87a07e29b691afdc323e85515f25d9d2789fc49c9fb3d849d757098660c4dd2`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	2627 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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