PDF malware analysis — malicious · b38429efaff0caf1

MALICIOUS

PDF

26.6 KB Created: 2011-02-28 17:20:56 +02:00 Authoring application: Auto Loan Low Rates (via mPDF 5.0)

MD5: ae8f7a8cedb40fbf5378ee0738e11e51 SHA-1: e01ada3d0c10a2c5939fb23945d1358b3908e00b SHA-256: b38429efaff0caf1615018709b057fc4f06e073a1d2af3d26852e2c73b284bd0

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript streams that are obfuscated and utilize unescape functions, as indicated by the heuristic firings. The ML classifier strongly suggests malicious intent. The extracted JavaScript files, javascript_obj0020_000.js and javascript_obj0020_001.js, are likely responsible for executing the malicious payload. The exact functionality of the scripts could not be fully determined due to obfuscation, but the presence of JavaScript actions and streams points towards a downloader or exploit execution pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0020_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 20 at offset 0x636F	136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`javascript_obj0020_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 20 at offset 0x636F	134 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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