PDF malware analysis — malicious · 7af61f5c16fbedbb

MALICIOUS

PDF

7.3 KB Created: 2009-12-17 16:59:10 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 42f7688c78aaee8158bacd58953df6dd SHA-1: 73524e0fcb10d08bc01bacf712db67fe4902f276 SHA-256: 7af61f5c16fbedbbaf6cf4879f65bfd3f33b68c83acece7ff437f548c0c1cdec

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating an attempt to execute obfuscated code. The ML classifier strongly flags this PDF as malicious. The JavaScript attempts to execute a function that is likely part of an exploit, aiming to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0021_000.js` `1a3b176b805aa1809ed45dafb1c07b3116b3fd73a6be349a3e49a17399085922`	pdf-javascript-stream	PDF /JS object 21 at offset 0x1883	559 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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