PDF malware analysis — malicious · 381f59719b80bc8a

MALICIOUS

PDF

4.0 KB

MD5: 5327f51a419477f51df5d7c1a926939f SHA-1: dfa2b44d1a4e9d148b8ce62db52847f8f0da753c SHA-256: 381f59719b80bc8aa652b2b385a816d0a130adb54e5879e6ecc4c82e3cc6e988

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream includes an eval() call and uses String.fromCharCode, suggesting obfuscation. The ClamAV detection 'Pdf.Dropper.Agent-7249618-0' strongly suggests this is a dropper. The primary function of the obfuscated JavaScript is likely to download and execute a second-stage payload.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7249618-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7249618-0
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` `fbde258b7cedcc0fb78513a10eba76e02b9a6e58e043fb6a7a2e2dab130ccd47`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6301 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` `83b4d52fa046776a30b50417fd887305af35e7696c19a44b406866cdb9098999`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3571 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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