PDF malware analysis — malicious · 7b5502bc33b8167c

MALICIOUS

PDF

118.5 KB

MD5: 78d8b248c629da01fe769f22ffd86c5d SHA-1: 7ffba5f7f0fbe40fe6cef0da41bb58d601bf5bb1 SHA-256: 7b5502bc33b8167c26b011a6c925dfdca0650ac973f5a24c9d99459f297131ec

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities and delivering malware. Heuristics indicate the use of eval() and fromCharCode, suggesting obfuscated JavaScript code. The 'Large comment-padded JavaScript eval stager' heuristic and ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly indicate malicious intent. The embedded JavaScript likely downloads and executes a second-stage payload, although the specific URL or payload could not be determined from the provided evidence.

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` `5a15b34c228f7eaeb95802f7b606ea4db5a406df22aaed7530eae314cc1de264`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626237 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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