PDF malware analysis — malicious · 2a59ff7d0f7ff6bc

MALICIOUS

PDF

118.5 KB

MD5: a90f33168460045e5b2e2868d5084760 SHA-1: f5826b223b8341b253dbb636ec6ba7118ad1c63c SHA-256: 2a59ff7d0f7ff6bc6df312bcd8c7caf7b4f4aa95e926a87b1119d0c4cea44910

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a large comment-padded eval stager and calls to eval() and String.fromCharCode(). These heuristics, along with ClamAV detection as Pdf.Exploit.Agent-36086, indicate the PDF is designed to exploit vulnerabilities. The embedded JavaScript file 'javascript_obj0006_000.js' is the primary artifact for further analysis, likely containing the exploit code.

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` `50378e886bc07bced57f9e37fb731bd27faef682c5607ec24f6d47b6ad5b6f90`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	625834 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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