PDF malware analysis — malicious · 824145bbe4077cdd

MALICIOUS

PDF

38.7 KB Created: 2011-01-17 00:59:29 +02:00 Authoring application: Vacant Land Loans (via mPDF 5.0)

MD5: d217d18938a26727d7e473d4a382e110 SHA-1: e567ede93c8454458e4e10125ad26a4dbc989d78 SHA-256: 824145bbe4077cddc7406d857dea03a1f1e7f421b4e5b104f5719355e89a8467

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript streams, flagged by heuristics for obfuscation and malicious content. The ML classifier strongly indicates maliciousness. The JavaScript actions, including unescape calls, suggest the script is designed to download and execute a second-stage payload, which is a common technique for malware delivery.

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 0x9375	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 0x9375	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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