PDF malware analysis — malicious · fbb12cf429c6a083

MALICIOUS

PDF

31.0 KB

MD5: 066f4e2b38927a62ee4f4e04e45e25f0 SHA-1: bca448602be02b98ad64d469dfe506585467c4d3 SHA-256: fbb12cf429c6a083ec82ec8871d3eeb1663257b858dea72194dd3609b1a60e18

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript and a Flash object (JDOayJJbwux.swf), both flagged as malicious by heuristics and ClamAV. The ML classifier strongly indicates maliciousness. The embedded JavaScript and Flash object are likely used to exploit a vulnerability within the PDF reader to download and execute a secondary payload. The ClamAV detection 'Pdf.Exploit.Agent-35955' further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9945

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
`JDOayJJbwux.swf` `c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x11DD	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` `1e7f00c471c6f55d646a8839685cb9c8dcac6fb29fa3cbd2f46216395d2343fd`	pdf-javascript-stream	PDF /JS object 6 at offset 0x13C	3045 bytes

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