PDF malware analysis — malicious · ee156faf5b66d250

MALICIOUS

PDF

10.9 KB Authoring application: .a

MD5: ad9f606d415a107bd8c202448803f201 SHA-1: b0cae22671f7d4738eb801fd0f07ae59cfd2e852 SHA-256: ee156faf5b66d25027715b5678ce8c15713c47e3c38d5e00c3caca39a8014193

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_UNESCAPE'. The ML classifier also flagged this PDF with high confidence. The extracted artifact 'javascript_obj0018_000.js' suggests the script is obfuscated and likely responsible for downloading and executing a second-stage payload. The document body content is unreadable, but the presence of JavaScript and the ML classification strongly indicate malicious intent.

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` `4487bab0c5fdc043f932a736f43b17dd2d9afc2f2540c1013a53e4d18becd09f`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	162315 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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