PDF malware analysis — malicious · 43fe770731a59f13

MALICIOUS

PDF

3.4 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 24ca3bb5e3843ad86fb8302f97cc709a SHA-1: ccaf63728814fd9c3cd7463fb7a20fa1169258be SHA-256: 43fe770731a59f13ba7f46b2ac8d94d27d5b93b35c4e80cb7f80fb2127622200

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_UNESCAPE'. The ML classifier also flagged it as malicious with a high probability. The embedded JavaScript streams, 'javascript_obj0013_001.js' and 'javascript_obj0013_002.js', are suspicious artifacts. The script likely attempts to exploit vulnerabilities or trick the user into executing malicious code, consistent with phishing or credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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_001.js` `f35eb7faebb75d57f82270ddca0f118e5027bc1d69c658cf6ffc8fd439a202a4`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3DC	1811 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0013_002.js` `b9a017d520940efcda0bc019fb52e871f4c29d7feb317756e3d71daccdace36b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x402	2447 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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