PDF malware analysis — malicious · 23506325bde1d1ba

MALICIOUS

PDF

118.7 KB

MD5: 291ad819adb7fa61694c0ae8c8644106 SHA-1: 3a2b0a5eb0ce1e0c33359291cfee04345e8da3fd SHA-256: 23506325bde1d1babc0dabfdd833a67967e7cac1e2988bfab8690d2dacb74706

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including calls to eval() and String.fromCharCode(), which are indicative of obfuscation and exploit stagers. ClamAV detected this file as 'Pdf.Exploit.Agent-36086', strongly suggesting it's an exploit delivery mechanism. The presence of JavaScript and the 'eval' heuristic point towards the execution of malicious code, likely to download and execute a secondary payload.

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` `6fa297a0c7c3ab27554bd549e48c820741b35d6bc34c6b2d3165e74b9deb7973`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627860 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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