PDF malware analysis — malicious · a4ed9422479669da

MALICIOUS

PDF

1.6 KB

MD5: 20b2b2c0180a38b4af0302e0e230b779 SHA-1: 26b328fe955d35ecba5447c7db0557bf1d5404e1 SHA-256: a4ed9422479669da34d7f10545f5a3bcc0acf7f8c05eeef1ae90763e8fab6fb5

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_FROMCHARCODE. The embedded JavaScript stream, named 'javascript_obj0009_000.js', is likely responsible for executing a malicious payload. ClamAV also flagged this file as Heuristics.PDF.ObfuscatedNameObject, further supporting its malicious nature. The exact payload and delivery mechanism are unclear due to obfuscation, but the presence of JavaScript points to code execution.

Heuristics 6

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0009_000.js` `d289e2d9180cddc3109054578d3421837fa6587ab22c36d2fd95b2100d292dfb`	pdf-javascript-stream	PDF /JS object 9 at offset 0xDC	3898 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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