PDF malware analysis — malicious · 85fa32a983b4b6aa

MALICIOUS

PDF

51.7 KB Created: 2011-01-24 16:40:12 +02:00 Authoring application: Auto Loan Chicago (via mPDF 5.0)

MD5: add0486b5155908f2b09deaae6128969 SHA-1: 98fa6abf5783589bafb550e426779e5cd02a4067 SHA-256: 85fa32a983b4b6aa4d2a8c99ea088f0d04f20077faa0dbad2d779c0411bfc77a

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript streams that are obfuscated and utilize unescape functions, indicating malicious intent. The ML classifier also flagged this PDF as malicious with high confidence. The presence of JavaScript actions and streams, combined with the ML detection, strongly suggests the PDF is a delivery mechanism for further malicious activity, such as downloading and executing a second-stage payload.

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).

Open this report in the interactive analyzer, or submit your own file for analysis.