PDF malware analysis — malicious · 3c08a7577b2f7837

MALICIOUS

PDF

118.5 KB

MD5: ce9285404bc10b443c84cd9db65c4aed SHA-1: f44040007f10db13315b9d9bb271fe07f51b6a37 SHA-256: 3c08a7577b2f78374bacbc83b7ebfb1a11157b711de09ebbd5848b3ff60f8a39

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, including a large, comment-padded eval stager. This JavaScript is heavily obfuscated and utilizes String.fromCharCode and eval() calls, indicating an attempt to hide malicious code execution. ClamAV detected this file as 'Pdf.Exploit.Agent-36086', strongly suggesting it is an exploit delivery mechanism. The primary attack pattern involves leveraging JavaScript within the PDF to execute arbitrary code.

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` `19d517b4b94f9ce0af04aa87b8e53badf86f876a37ae20f9dbe08f318f26a764`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626661 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` `579afec42f820668804f311e1365caa599abfa3c306041009bbac503d98efb73`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 481 long base64-like blob(s).

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