PDF malware analysis — malicious · 98f9e5b71ea3ad95

MALICIOUS

PDF

9.9 KB Created: 2009-10-04 13:45:55 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: de5381a3a19a1ac57251e9c32b9ff28d SHA-1: 90f51f6910714cab81599bb4a7f8405f2c914ba2 SHA-256: 98f9e5b71ea3ad95ff011ace308d4c2b4ec798cccc275b4bd67f59d6dfadb90a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file exhibits multiple high-confidence heuristic firings indicating malicious JavaScript content. The embedded JavaScript stream, named 'javascript_obj0013_001.js', is heavily obfuscated using techniques like unescape() and String.fromCharCode(), suggesting an attempt to hide its true functionality. The ML classifier also strongly flagged this PDF as malicious. The primary intent appears to be the execution of this obfuscated script, likely to download and execute a second-stage payload or exploit a vulnerability.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0013_001.js` `cda966eaabe2bbb5225783927977cd3106f68967dea6e7c7046351a92a3a82d0`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	11634 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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