PDF malware analysis — malicious · 4abd2c87db062676

MALICIOUS

PDF

118.8 KB

MD5: 8dacdde69dec9bd7033d7231bc29b0bd SHA-1: d652821f5d443742d0f5265349c60d9dadea0c46 SHA-256: 4abd2c87db062676f61cc60c53bdeb3a6c8fd8941d6345a3ef8bac786a2b79c4

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The critical ClamAV detection 'Pdf.Exploit.Agent-36086' and multiple high-severity PDF heuristics (PDF_EVAL, PDF_JS_LARGE_COMMENT_PADDED_EVAL) indicate this PDF is designed to exploit vulnerabilities. The embedded JavaScript, particularly the use of eval() and String.fromCharCode, strongly suggests it's a stager intended to download and execute further malicious content. No specific family could be identified, but the attack pattern is consistent with a PDF-based exploit delivery mechanism.

Heuristics 7

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)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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` `e4cd46d3780bbfaef3651d43dd57aa4c73f8d42c545ec01b0448f2716bf6fb47`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626766 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).

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