PDF malware analysis — malicious · b023ae573b89005e

MALICIOUS

PDF

31.8 KB

MD5: f90864bcd62ca7480ba44191cc4b681e SHA-1: 01696e2dedfc700a7e69afcb01fac3a42fd44d6a SHA-256: b023ae573b89005eccf5dfd4a64cb800e2b642893d742eca674ed6075255e0b6

216 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious Attachment T1559.002 Component Object Model Hijacking

This PDF file was flagged as malicious by ClamAV with the signature Pdf.Exploit.Agent-35955. Static analysis revealed embedded JavaScript and a RichMedia (Flash) object, indicating an exploit attempt. The embedded Flash file, tLfjyRkvK.swf, is highly suspicious and likely contains the primary exploit or payload. The ML classifier also strongly indicated maliciousness.

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
`tLfjyRkvK.swf` `c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x14EE	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` `7826403a1e83d5b6b7ddbdb9ab34350bbff8dc83520f408498cc5e63831bf325`	pdf-javascript-stream	PDF /JS object 6 at offset 0x13E	3575 bytes

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