PDF malware analysis — malicious · c5e9d1af9cdffbb5

MALICIOUS

PDF

15.7 KB

MD5: 276e665da79b1de95e0a873587cb2f1a SHA-1: 4498c2fa11a37c3ec13a4dd8a5aa2b097a47689e SHA-256: c5e9d1af9cdffbb54a7d345530e1c6e634fe9dcaff0f40a78cb86c0d80f07df6

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a high-severity heuristic for a large comment-padded JavaScript eval stager. This indicates the script is designed to obfuscate and execute a payload. ClamAV also detected this file as Pdf.Exploit.Agent-36086, further supporting its malicious nature. The primary IOC is the embedded JavaScript file, which is likely responsible for the exploitation.

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` `18070751d3f2ab415ba3ea5f41756b8eea2f182c1fa0c01b6f4ea05e28b6dd80`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425525 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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