PDF malware analysis — malicious · ca44f6ef092bb78f

MALICIOUS

PDF

118.4 KB

MD5: 0c84f2d8cf9927b02cede53f6f4f789f SHA-1: eed823e5d74b5e1ec65e033a78ba7af6b9e559ff SHA-256: ca44f6ef092bb78fe55430549abbafd92724a20e767ae5172c4d80782c1af57e

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious Link

The PDF contains embedded JavaScript, including a large comment-padded eval stager, indicating an attempt to obfuscate and execute malicious code. ClamAV detected this file as 'Pdf.Exploit.Agent-36086'. The primary IOC is the embedded JavaScript file, which likely contains the exploit payload. The lack of document body text prevents a more specific determination of the lure, but the presence of JavaScript and exploit heuristics strongly suggests an exploit-based attack.

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` `c29367dfbfbb77ca9d996d6212d0e12f86e0d11d6a47a281324546f6843dc515`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	625985 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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