PDF malware analysis — malicious · 3965703756494eed

MALICIOUS

PDF

2.2 KB

MD5: 2e409ea58373dbec0e64dced9c757a58 SHA-1: 1c14cce40155afc3fe037b1d2b0d3abb8cf145c4 SHA-256: 3965703756494eed92c5422a7aefcb03fc3061b4df83c18c90c0b00778bf1375

166 Risk Score

Malware Insights

MITRE ATT&CK

T1027 Obfuscated Files or Information T1566.002 Phishing: Spearphishing Attachment

The PDF file contains embedded JavaScript, which utilizes `eval()` and `unescape()` functions, indicating obfuscation and likely malicious code execution. The ClamAV detection 'Pdf.Exploit.Agent-36098' strongly suggests this is an exploit-laden PDF. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', are indicative of a dropper or exploit loader.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36098 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36098
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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_obj111611_000.js` `e1ab3bbf30605cecdce6db9d2556198626dbb178f7a4cb471a9436bb6e8bd92f`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x798	462 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `f7b36095cb4ce6b9ad4d5beb0ee170273838a6d5b4424e6e57004195899438de`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2834 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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