PDF malware analysis — malicious · aa46836f987fce83

MALICIOUS

PDF

22.8 KB

MD5: a3f83cdcdaa006b2215235879c317549 SHA-1: 49ef161912d11ba238b5b74d6a6fb3915c9f8778 SHA-256: aa46836f987fce838e590b07fa5853e2d3d710d1ed19d9b184e74cb23239bb55

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() functions. The ML classifier strongly indicates maliciousness. The JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'Suspicious extracted artifact' heuristic. No specific family could be identified due to the obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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_obj3332_000.js` `41b85b352566cdf5433d1a43e699608832fbd07da1d5ce3e5141aea5b1c53f26`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x58F3	252 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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