PDF malware analysis — malicious · 3aaa51d5aabb47ca

MALICIOUS

PDF

118.5 KB

MD5: cae9f7b8cb0aec4b6dfb2f99e667e0ba SHA-1: 13d44c4dcc4f3c8e29b90f86ab3c0c4d7c220e2b SHA-256: 3aaa51d5aabb47ca34cab8cd19a4f524907cda092dcbf47f546a2a996fea5d63

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link T1566.002 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV (Pdf.Exploit.Agent-36086). Static analysis revealed embedded JavaScript with high-confidence indicators of malicious activity, including `eval()` calls and a large comment-padded JavaScript eval stager. These heuristics strongly suggest the JavaScript is designed to de-obfuscate and execute an exploit, likely leading to the download and execution of a secondary payload. The PDF structure and JavaScript usage are common delivery mechanisms for exploits targeting PDF viewers.

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` `d1961c23ae0cb6277ef0390931aa1708459e4ebc7c74dce8385e268c8ef11c16`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626874 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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