PDF malware analysis — malicious · 5506a779922f619c

MALICIOUS

PDF

118.7 KB

MD5: 867ca2044d1d0a0e84fef0f5af36c5db SHA-1: 25d04e3d663aaa0f54648a34957fcb6c7b0f62d4 SHA-256: 5506a779922f619c5318e036c8ed8d94c88c95c443eb7714f7895cc909e0d4ee

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a large, comment-padded eval stager. This script is designed to deobfuscate and execute further malicious code. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly indicates a known exploit, and the presence of JavaScript with eval calls points to a common delivery mechanism for second-stage payloads.

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` `a39454a17434b4c710e677af4a99ab2ee2bf8ec4574405f8fac0e43f468a3b47`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627419 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` `4c5ba95fe941de1eaa06bab685b50bb023f5b6662f8f9d3af4abe0e0c105fdd0`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 602 long base64-like blob(s).

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