PDF malware analysis — malicious · 4f546b4818b315c9

MALICIOUS

PDF

15.7 KB

MD5: abc5c618b9f536fe3d6d0536ff321d7f SHA-1: cdfbaf87d0f14ea0da363d5d16699a0feb5c2126 SHA-256: 4f546b4818b315c9f54f102d870602ccc6e62562b066c1af15e54a70ef80958c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a high-severity 'eval()' call and a 'Large comment-padded JavaScript eval stager'. These heuristics, along with the ClamAV detection 'Pdf.Exploit.Agent-36086', strongly indicate that the document is designed to exploit a vulnerability. The primary attack pattern involves leveraging JavaScript to execute malicious code, likely to download and run a secondary payload.

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` `464260f9c982f0c66069caa7b8935d1a6a12a1f24d2cb45c018f170cf611ac95`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424616 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_off00003d20.bin` `06393c871ef86a73057fad2fe23ab6d41a02209a780b6d4b89cf408722c5a885`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3D20	200 bytes

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