PDF malware analysis — malicious · b4ae5dc8865905c3

MALICIOUS

PDF

1.5 KB

MD5: de3b9619aae1e2ed862d6e9b33684967 SHA-1: 7051eee14f7e905aa973d67948594a897157cdfa SHA-256: b4ae5dc8865905c3de6bdf1a722aef6db2a779c6ec4fc75eac6b80f618bc658c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings. The JavaScript stream utilizes `unescape()` and `String.fromCharCode()` functions, suggesting obfuscation and dynamic code construction. The ML classifier strongly flags this PDF as malicious, and the overall analysis points to a malicious PDF designed to execute arbitrary code via its embedded script.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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_obj0005_000.js` `e0c5c2f0dacb3ed888762a980e9d65c5bc56f31395b9a0abb89fefb3ef27b1fb`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	4516 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).

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