PDF malware analysis — malicious · 9f3b7d67ae294a35

MALICIOUS

PDF

9.2 KB Created: 2010-05-11 20:42:53 Authoring application: gdJyX3XgWAK (via e1qHt9KEzGJ)

MD5: dadf46ed11302b9bfd8690a6ec34cb4b SHA-1: 5d265be0f0be1fd34644ff6ca7ead1d6ff571d84 SHA-256: 9f3b7d67ae294a35fef84a8b7270a60e7c68377e5e48e44da1f86ed29fff1e4e

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call within the decoded JavaScript stream (PDF_EVAL) strongly suggests that the script is designed to execute arbitrary code. The ML classifier also flagged this PDF as malicious with a high probability. While the specific actions of the JavaScript are obfuscated, its execution is the primary mechanism for delivering the malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `2bd598b57f461ee42c3b7c46a9876a58bcae5752d6d2e307720e9a064fcd5229`	pdf-javascript-stream	PDF /JS object 7 at offset 0x238	8013 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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