PDF malware analysis — malicious · 394c8fb8c567957b

MALICIOUS

PDF

31.2 KB

MD5: d7a708e333e3803b5c684a234a066198 SHA-1: 7ad6e8105356624c7b574c3cb36044fcc0e82164 SHA-256: 394c8fb8c567957b2e073e602b37039c4e09732965946602da45208795004c6b

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a Flash object (TyPWoIJRMY.swf), both flagged as suspicious. The ML classifier strongly indicates maliciousness. The embedded JavaScript, particularly the deobfuscated 'legacy_pdfkit_stage_000.js', likely attempts to download and execute a second-stage payload, a common technique for initial access or further infection. The presence of these embedded objects suggests an attack pattern focused on exploiting document viewers or delivering malicious content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`TyPWoIJRMY.swf` `767382813fc770c9716554c3266b22eee1636037ca964af05acf6ff66db4a27d`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x11CE	26993 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `0ddcb598166d6f22ce2fbef898b9a01262e3279729cc3e9674e73c43cdc6d587`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF9	3461 bytes
`legacy_pdfkit_stage_000.js` `7bc5a54b78ad4deea49256c319c84e28544e425f0e0833682c4f8778f0a95582`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0xDA7	2128 bytes

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