PDF malware analysis — malicious · c5d6328497762953

MALICIOUS

PDF

2.4 KB

MD5: 1c465bc2376bd5d79bf8bea6b676d18b SHA-1: 5a69d032313a63d8a278b3dcce392ab0e794222d SHA-256: c5d6328497762953719ffe26c12886c3de164ab6178dd59ca18bae4d0ba626ce

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded and obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also flagged the PDF as malicious with high confidence. The embedded JavaScript file, 'javascript_obj0005_000.js', is likely responsible for downloading and executing a second-stage payload. The obfuscation and use of eval() suggest an attempt to evade detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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.
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. (matched inside decoded stream)
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_obj0005_000.js` `0ff3fdbeb392122e86ca31093a03f41c89654a61a292674290596b1f277131a1`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	2444 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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