PDF malware analysis — malicious · 36b85b48783be3aa

MALICIOUS

PDF

2.7 KB

MD5: c05f193c5453880d3958c63e5259059e SHA-1: 285ef5dc25fb165483dea3c80f35df4d99f0b47a SHA-256: 36b85b48783be3aa8bba0522c081d27b2cd55ffa8e8232b2c38ce9340a674978

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by ML classifiers and ClamAV, identifying it as Pdf.Dropper.Agent-1828710. It contains embedded JavaScript, including obfuscated streams and calls to eval() and String.fromCharCode(), indicating an attempt to execute malicious code. The presence of these JavaScript elements suggests the PDF is designed to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-1828710 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828710
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `2ae2b3eaf383d2969d7b559604131ffe8ad02b5d65bb16399874596d2252e282`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `45d738cf8b52c6a2e3d92a91c57ba896e7815276e514f4ffe82180e90475bcf9`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	3310 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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