PDF malware analysis — malicious · 1ced1eeb4f4ac820

MALICIOUS

PDF

1.5 KB

MD5: f2beb5d731a8e79e40dbcca28082a28e SHA-1: 148af7bbd21d616b562ae7f4033106ac7cfe86b3 SHA-256: 1ced1eeb4f4ac820447e791b322801560cd1de6bfe55826f112aaa809984ca93

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flags this PDF as malicious. The JavaScript stream, identified as javascript_obj0005_000.js, likely contains obfuscated code designed to download and execute a second-stage payload, as suggested by the PDF_UNESCAPE and PDF_FROMCHARCODE firings which indicate common JavaScript deobfuscation techniques.

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` `5fe049869f330c37f8b7bb0389b3d71216b71cfc945fc1236cc0549663c425ad`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	4823 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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