PDF malware analysis — malicious · 348ca6b2ea5861a5

MALICIOUS

PDF

226.2 KB

MD5: 73fab2355ae3d57e7e84031abc748008 SHA-1: 4def7268d69463c5e98c2ad5c6da090c2d7f5f4c SHA-256: 348ca6b2ea5861a5e2c045f579053780f9232480e72041be59b5b1555b36c522

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The file is a PDF containing embedded JavaScript, as indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests an exploit is present. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is highly obfuscated and likely responsible for downloading and executing a secondary payload. The presence of eval() and String.fromCharCode() calls within the JavaScript further supports this conclusion.

Heuristics 6

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `d1b14fcde550e4c7b1dbc69018c0913301e4ea513b17b13f3f09b7e8232e6009`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	322569 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 10 long base64-like blob(s).

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