PDF malware analysis — malicious · b234d9e4e91dee60

MALICIOUS

PDF

220.7 KB

MD5: 4c85f58df1e88d2c44058feb8c7ca35b SHA-1: 943fc4384276129f62430d0aba49cd7d51810d2a SHA-256: b234d9e4e91dee608f6f1d0a6ea24a3bcab623c93d5e0ca0272fd7a08fd8efdf

244 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF contains embedded JavaScript and a Flash object, both flagged as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and Flash are likely used to exploit vulnerabilities within the PDF reader and execute further malicious code, as suggested by the 'Swf.Exploit.Kit-513' ClamAV detection.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 10

ClamAV: Swf.Exploit.Kit-513 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Swf.Exploit.Kit-513
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
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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.
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
`aaa.swf` `82959a74bd2f365dbaff0af8a126e8d6efed63f658723f179f7020ea3628ed8b`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x2C9AC	27931 bytes
Detection ClamAV: Swf.Exploit.Kit-513 Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `ea63314c5040681568a9c0b1ba7b8657559dbb77f70f21a96d35032235002f15`	pdf-javascript-stream	PDF /JS object 6 at offset 0x122	439551 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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