PDF malware analysis — malicious · 569b24f03b0e3795

MALICIOUS

PDF

15.7 KB

MD5: 4c9fe5300151f2722861bd0cc67a4fdf SHA-1: 647257ebf4fae2b10a2dfc953f8bd423aff8710a SHA-256: 569b24f03b0e379561c4d539ad2430239419625daec314812d0e222f909f4303

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a heavily obfuscated 'eval stager' that is designed to execute arbitrary code. Heuristics indicate the use of `eval()` and `String.fromCharCode`, common techniques for code obfuscation and execution within PDFs. ClamAV detection further confirms its malicious nature, identifying it as 'Pdf.Exploit.Agent-36086'. The primary function appears to be the execution of a second-stage 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` `3dbc1bb6883c09662458bcc5e1d860d68c2647dd9ace2c383f0795ec1ab63ea1`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	426058 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` `af0b19286c490f77e2f5206f3950f0722a5ed8b839fd4a448f74fae7c6705b78`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 640 long base64-like blob(s).

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