PDF malware analysis — malicious · 7f3b69e325c39a23

MALICIOUS

PDF

1.08 MB

MD5: 462ee243a2a297c7dbb1ddc7bb9978e0 SHA-1: 8176d4df8c6327cbba9b05278ce4f979b45630c3 SHA-256: 7f3b69e325c39a2357be33f07a4a20fd5e52bb88c9c89632769d3f3317f6f731

364 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that utilizes eval() and String.fromCharCode() for obfuscation, a common technique for exploiting PDF vulnerabilities. This script is designed to drop and execute an embedded Windows executable payload. The presence of the embedded PE file and the critical heuristic firings strongly indicate a malicious intent to deliver a second-stage malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

Heuristics 11

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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 0x10C4B1	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` `12aadf2dbbe9ab588f7a6911f923be023a62561e0b4e3bef04603a4cdf5aef73`	embedded-pe	PDF raw stream PE payload at offset 0x346	1089713 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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