PDF malware analysis — malicious · bffe20c67cbf61f7

MALICIOUS

PDF

38.9 KB Created: 2011-02-24 16:02:50 +02:00 Authoring application: WIKI BRIDGING LOANS UK (via mPDF 5.0)

MD5: c71d837ba49a9fed6b6863118b7fb825 SHA-1: a6712d11fc0b246d39a96c8a84a3305779eaaf29 SHA-256: bffe20c67cbf61f78f48ed419551aa33bcb102de08e3d3822b6db5dd6ebc4f46

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams that are heavily obfuscated, indicated by the 'unescape()' calls and 'Script obfuscation indicators' heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The presence of these obfuscated scripts suggests the document's primary purpose is to act as a dropper, likely downloading and executing a malicious second-stage payload from an external source. No specific family could be identified due to the obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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_obj0027_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 27 at offset 0x9435	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_obj0027_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 27 at offset 0x9435	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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