PDF malware analysis — malicious · 3efacb0d4b5a5826

MALICIOUS

PDF

39.0 KB Created: 2011-01-18 15:22:11 +02:00 Authoring application: Loan Comparison Calculator (via mPDF 5.0)

MD5: afa9975b1f4c04029f69f67da2945041 SHA-1: dc47d5f14f552182d55ea0c8b4714d75d3797256 SHA-256: 3efacb0d4b5a582615061e84f7afbd1c46b41a1d97f6bd121d2744c703c87ca9

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_UNESCAPE'. The ML classifier also flagged it as malicious with high confidence. The JavaScript streams are obfuscated, and the analysis suggests they are designed to download and execute a second-stage payload. Due to the obfuscation, the exact nature of the payload and its destination could not be determined.

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 0x93D7	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 0x93D7	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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