PDF malware analysis — malicious · 460ca0de0169d7a4

MALICIOUS

PDF

26.9 KB Created: 2010-12-07 23:33:26 +02:00 Authoring application: Working Capital Loans (via mPDF 5.0)

MD5: 19a0fddb4355626b71a7e02c78232bb1 SHA-1: 37686cb66f4546214e8b7d56cf10ed4a6c852553 SHA-256: 460ca0de0169d7a46454e2ea1376adfa6a9a36e2dccddf983ac5f92861e3418b

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript streams that are obfuscated using unescape() calls. The ML classifier strongly indicates maliciousness. The presence of JavaScript actions and obfuscated scripts suggests the document's primary purpose is to download and execute a second-stage payload. The extracted filenames 'javascript_obj0020_000.js' and 'javascript_obj0020_001.js' are included as IOCs.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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_obj0020_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 20 at offset 0x63E4	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_obj0020_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 20 at offset 0x63E4	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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