PDF malware analysis — malicious · e2c98b12d5b97bee

MALICIOUS

PDF

15.7 KB

MD5: 4d3b5dfb9da4a1172caf3405f7a6ce39 SHA-1: 9cab75113ea64562993f8a613476bd1b80d1b99c SHA-256: e2c98b12d5b97beed159fe4bb19eef17f0dc846018cfbc5d1bb2c2b27cfc3701

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a large comment-padded eval stager, indicating an attempt to obfuscate malicious code execution. Heuristics indicate the use of eval() and String.fromCharCode, common in JavaScript exploits. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests this is a known exploit. The lack of readable document body text prevents a more specific attack pattern description, but the technical indicators point to a malicious exploit delivery mechanism.

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` `51e38c70f61d4be3dd2093c49400d36049eed7554a28fd78bae94ad65cab7170`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424739 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).
`stream_002_off00003d0e.bin` `ec2da8e91cdac2eab6535d40f0336a11c17f1915f2f84e77bfebcb57e542f335`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3D0E	200 bytes

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