PDF malware analysis — malicious · d498391546087349

MALICIOUS

PDF

2.9 KB Created: 2007-01-01 11:33:12 Authoring application: Adobe InDesign CS2 (4.0) (via Adobe PDF Library 7.7)

MD5: 1044b8ca7ba92903b8b6ec099b38ff16 SHA-1: d8c1ae3a8e95eb4127544cb2b038f679eaf12ebc SHA-256: d498391546087349aa35e497c2f030b8fd4c0e66990eb060e7c989dceeaef331

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript file, javascript_obj0013_001.js, is likely responsible for executing the malicious payload. The presence of unescape() and ASCIIHexDecode filters suggests obfuscation techniques commonly used to hide malicious code within PDFs. The exact payload or delivery mechanism beyond the JavaScript is not clear from the provided evidence.

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)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0013_001.js` `c933562e705a6d7f9a50ba20a0d84fb3199faed407daf0bfbbc54e63ce7a8b41`	pdf-javascript-stream	PDF /JS object 13 at offset 0x389	4061 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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