PDF malware analysis — malicious · 4ac5a4e562bc97e0

MALICIOUS

PDF

15.7 KB

MD5: 785f67535f587fc97f3bd6c2bb0d092d SHA-1: d8bae5e9df90dadd5a4e8ac329833bec3694e6b3 SHA-256: 4ac5a4e562bc97e0cea53154bbd822a1e9e85b5c6fb7e7e0cb1dcf2663ba6793

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a large comment-padded eval stager. Heuristics indicate the use of eval() and String.fromCharCode, suggesting obfuscated code execution. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests a known exploit. The primary attack pattern involves leveraging these JavaScript capabilities to execute malicious code, likely a downloader for further stages.

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` `0efbeec712f2055f9b0d694d75e6dc664f70883333420457acf9987d88bfd961`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425443 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` `942593ce45ec05e857b2a39aa9e434e85f8ae71f374053dab026c15b613de88f`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 559 long base64-like blob(s).

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