PDF malware analysis — malicious · c83050879cb0a0be

MALICIOUS

PDF

918.6 KB

MD5: 49c0b3022abea44556a0ce3fbfbb2fc6 SHA-1: 0241bff5b03d0b329e152716074abfd87612714b SHA-256: c83050879cb0a0bea02a7285eb8186ff8d3b035894edd9198cb5123c0ebc40a4

302 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation and potential malicious code execution. Critically, a Windows executable payload was extracted from the PDF stream. ClamAV also detected the file as Win.Malware.Agentb-9808245-0, and a static triage of the extracted PE file flagged it as suspicious due to obfuscation and high entropy. The overall attack pattern suggests a document-based exploit delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 10

Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD

PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
ClamAV: Win.Malware.Agentb-9808245-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Malware.Agentb-9808245-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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)
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/2.6/
- http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `d5143d101bd3d5f5711b507d0d62b473189a38d21b4b9560b361fbcd59f5d4c7`	pdf-javascript-stream	PDF /JS object 12 at offset 0xDD95F	13967 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`embedded_pdf_00000346.exe` `89fb4a4bb2948e33d80fe25468f9c31fe92cd79edab16c86ecf2d393e276fb75`	embedded-pe	PDF raw stream PE payload at offset 0x346	898399 bytes
Detection ClamAV: Win.Malware.Agentb-9808245-0 Obfuscation or payload: likely Carved artifact entropy is 7.82, consistent with packed or encrypted content.

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