PDF malware analysis — malicious · 412fac09c4a7a869

MALICIOUS

PDF

118.7 KB

MD5: 1546ae94b07d55eae171991e13e9c4a8 SHA-1: 36e9239522afff1f323198f7302fd1c929e262bd SHA-256: 412fac09c4a7a86937d07b93224f275921d321553f4787291ea82e282f9a5786

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is identified as a malicious PDF by ClamAV. Static analysis reveals multiple JavaScript-related heuristics, including eval() calls and large comment-padded JavaScript stagers. These indicate the PDF is designed to execute embedded JavaScript, which is a common technique for delivering exploits or downloading further malicious content. The presence of 'javascript_obj0006_000.js' and 'legacy_pdfkit_stage_000.js' further supports this. The exact payload or exploit targeted is not discernible from the provided evidence, but the overall pattern suggests an 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` `e3aa016b1481f9f9d4462947f2fef961a8308f14f88da3ad787d45fcada15a32`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626388 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` `4975bd9948c370f1192ea7a4a08abbfc4268832dffafa7e088e2e8d97b69b16a`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 638 long base64-like blob(s).

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