PDF malware analysis — malicious · d77f2dde46a1b882

MALICIOUS

PDF

33.4 KB

MD5: e0356f71aae2f81e80129987f7003e73 SHA-1: 012141d05ca8473cfe1f385046d4cd766b6044bd SHA-256: d77f2dde46a1b882fd0fc650f6356511d5c66c7bb929e1b68eef85a6b3d81813

218 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and a RichMedia (Flash) object, which is a common vector for exploit delivery. Static analysis detected an embedded SWF file, and ClamAV signatures confirm it is an exploit kit. The ML classifier also flagged the PDF as malicious with high confidence. The primary attack pattern involves leveraging a Flash vulnerability to execute arbitrary code.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 7

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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
`XDBlIRViaEGKDH.swf` `82959a74bd2f365dbaff0af8a126e8d6efed63f658723f179f7020ea3628ed8b`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x1702	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` `6109cdcfdcd5d68cf38a02bb5036d7b77aba921b5e25eb1d0400c49035ca7a3d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x14E	4128 bytes

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