PDF malware analysis — malicious · 78bbb79def7e957c

MALICIOUS

PDF

31.6 KB

MD5: ef384c695a3e1dead9c483c7550a23d4 SHA-1: 7428aeeed3f4b6a50cb19a3033abf1aba95766cf SHA-256: 78bbb79def7e957c968e30f4aa2498b5b8a7aed1b32b2bafe94774624603cbb1

216 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The PDF file contains embedded JavaScript and a RichMedia (Flash) object, both flagged as suspicious. ClamAV detected the file as 'Pdf.Exploit.Agent-35955', indicating a known exploit. The embedded SWF file, 'neXsrEkQVEBthK.swf', was also flagged by static triage as suspicious. These elements strongly suggest the PDF is designed to exploit vulnerabilities and deliver a malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 7

ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
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.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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
`neXsrEkQVEBthK.swf` `c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x1456	26774 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `e810e232aa1f8a8f80c050263f8803c20f9506bda963b068657e89c73f480856`	pdf-javascript-stream	PDF /JS object 6 at offset 0x13E	3541 bytes

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