PDF malware analysis — malicious · 94d49d70dba3cd5d

MALICIOUS

PDF

118.5 KB

MD5: 2fef391cdeaf296b2f079217043514de SHA-1: 6881a3c9eff2d5a40737abedc3f1fbca87853a56 SHA-256: 94d49d70dba3cd5d4a999c30d3489a85ed222513b7da756c9e17b1ffb197a72d

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple JavaScript streams, including one with a heavily padded eval stager. The presence of PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL heuristics, along with the ClamAV detection of 'Pdf.Exploit.Agent-36086', strongly indicates that this file is designed to exploit a vulnerability. The obfuscated JavaScript likely serves as a downloader for further malicious activity.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `f2d7fa63484342776b153f85feaca3dadc0b31fb035e8d251861c7f0358c3d75`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627444 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).
`legacy_pdfkit_stage_000.js` `a2bcafff017351f187c6ab4f48b4a582b5e2ea237ac21db78468a1687db57771`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 450 long base64-like blob(s).

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