PDF malware analysis — malicious · 31c9ed05eaff4c65

MALICIOUS

PDF

4.0 KB

MD5: e1d548efe71492b060cd9462ebb00aed SHA-1: 300b8184016c737ec67e0777145bdbc27fcd1760 SHA-256: 31c9ed05eaff4c658391d6f624da13dc4d3662699737067a90213888a1ff5a3b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as Pdf.Dropper.Agent-7246346-0. It contains obfuscated JavaScript, including calls to eval() and String.fromCharCode(), which are indicative of attempts to hide malicious code. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, a common technique for dropper malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7246346-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7246346-0
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_obj0013_001.js` `80716b520a78473277ae5b419f511518bc724efcec19803353b62f2f7d59fb87`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6353 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `f42e94e9a9437cb4d07a1e077fd10a39a56fa07d65703f7ea8706462b02e8fdb`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3612 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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