PDF malware analysis — malicious · 98d4508fed5994b1

MALICIOUS

PDF

11.0 KB Authoring application: Picked their every once he threw again until youll fingered them.

MD5: d5fdfae4a7103df46e0ae3687756991f SHA-1: 1e8d2b07f7e1227cac45b535d4e74d27c840fb9b SHA-256: 98d4508fed5994b1af949fe7be60ac9e55ecdfd33c4879c59801485fc7d608e6

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_UNESCAPE, and PDF_FROMCHARCODE. The ML classifier also flagged this PDF as malicious with high confidence. The embedded JavaScript file, javascript_obj0018_000.js, is likely responsible for downloading and executing a second-stage payload. The document body text appears to be unrelated filler content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj0018_000.js` `cfda072585400aeda274c0c58aea265506d8d84ab4fc49895107073401991727`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	162913 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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