PDF malware analysis — malicious · e6a54cdbcbb21602

MALICIOUS

PDF

2.8 KB

MD5: 33171848b13b97acd7069d31790d3ab8 SHA-1: 152e787cb2abd181a1bdd9414544bcf9f5079e15 SHA-256: e6a54cdbcbb21602e0732c39517f428212a8fe2d81bf2bb2e019a4bdde496957

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including calls to eval() and String.fromCharCode(), indicating obfuscated code execution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as indicated by the 'Pdf.Dropper.Agent-1829035' ClamAV signature. No specific family could be identified, but the dropper functionality is clear.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-1829035 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1829035
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` `5fb3204312549690481edea1529c067363aeca6c4a8436870bd5b6ea0516bfb4`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `ce8eb23a55ace54582071b5c5868544dd0a747a8cbdbba43d21af730753b2bf0`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x266	3362 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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