PDF malware analysis — malicious · 4c0f7ad70e542b4b

MALICIOUS

PDF

30.6 KB Created: 2009-04-15 04:08:27 Authoring application: ypNivAtsUCHrPWgkcL (via oMqAOqVFucXiqUQXwT)

MD5: 1084763e6ba39ae266849cdfdbd0e175 SHA-1: 55f5b6ab2977880a2a7eea7fb8ca1fd708982114 SHA-256: 4c0f7ad70e542b4be6936f0ab8103e4ce1b74c7d1c6cc79925e1fd05ea4783b7

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains heavily obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL with eval() and String.fromCharCode calls. The ML classifier strongly flagged this PDF as malicious. The obfuscated JavaScript likely attempts to download and execute a second-stage payload. The authoring application and creation date metadata appear to be obfuscated strings, potentially related to the malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `3695b0ca959c63f3ed365bac77cb06c7216684531a6ea392b8e47c133e92c80c`	pdf-javascript-stream	PDF /JS object 7 at offset 0x221	30117 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `937647378de82fd89d2c46dd3513740384f4fcad190590b941145db19db893aa`	pdf-javascript-stream	PDF /JS object 7 at offset 0x221	28369 bytes

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