PDF malware analysis — malicious · 308187f69394dd01

MALICIOUS

PDF

118.6 KB

MD5: 55d0328ea5c68e06d711f7bbbed002e8 SHA-1: 1c849b3fea13abd5ab1a59a42d9a87d0898b3338 SHA-256: 308187f69394dd01ef5dbd53e4e459ca2a35743a0396023aaa8a7707b4752721

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious JavaScript

The PDF file contains embedded JavaScript, including calls to eval() and String.fromCharCode, which are common techniques for obfuscating malicious code. The 'Large comment-padded JavaScript eval stager' heuristic indicates a sophisticated stager designed to evade detection. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests the presence of an exploit. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as indicated by the stager heuristic and the nature of PDF exploits.

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` `289f4e6750228903562292016e94d3f86309fec34b663f41221a9f008e98211b`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627041 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).

Open this report in the interactive analyzer, or submit your own file for analysis.