PDF malware analysis — malicious · 4a3bef4a2497263b

MALICIOUS

PDF

51.8 KB Created: 2011-01-11 13:30:00 +02:00 Authoring application: Spec Home Loans (via mPDF 5.0)

MD5: e56e574dd45b12bd341adc07bb3775c3 SHA-1: d12c9c5e27a94ee09b922ecd5fa3a3c92eed919c SHA-256: 4a3bef4a2497263bdb16583c180deb0b9fdc5a0f70d015a45e8684a076d45820

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier also flagged this PDF as malicious with high confidence. The presence of unescape() calls and obfuscated scripts suggests an attempt to hide malicious code execution, likely to download and execute a second-stage payload. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 0.9930

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_obj0034_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 34 at offset 0xC602	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_obj0034_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 34 at offset 0xC602	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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