PDF malware analysis — malicious · 1f3da55628e609fe

MALICIOUS

PDF

2.5 KB

MD5: 9b0c39268d644c5f9f0ff84e7be8dc6a SHA-1: f7337785000b07ca01746cc1fe7ba57a4141e12a SHA-256: 1f3da55628e609fe4dcea359af7bf4faaf990211f596d9399d47875347a3ae20

174 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment T1071.001 Web Protocols

This PDF file contains embedded JavaScript and a Windows executable payload disguised as 'exploit.txt'. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the execution of the payload, which is a common technique for delivering malware via seemingly innocuous documents. The embedded URL is likely used for command and control or further payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD

PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
Embedded attachment masquerades: declared document, content is windows-executable critical PDF_EMBEDDED_FILESPEC_CONTENT_MISMATCH

An /EmbeddedFile attachment's declared filename extension or /Subtype MIME type contradicts the magic bytes of its decompressed content. The attachment is declared as a benign document or image but the bytes are an executable or executable-bearing archive. This is a deliberate deception used to hide droppers in PDF attachments and is a generic indicator of embed-and-drop weaponisation, independent of any specific CVE.
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
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://www.doesntmatter.com

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`exploit.txt` `957d2e8fa442182d30a14cfb0bd39af8d54d49e9e825ce72ed9814b801627f4b`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x35D	1024 bytes
`javascript_obj0009_000.js` `5b27a7eace288d8cd0da0ccbf5e0a31d9d0cbe5565c703a53b57b889faa47953`	pdf-javascript-stream	PDF /JS object 9 at offset 0x496	1088 bytes
`javascript_obj0009_001.js` `66590aba88f37b7892071a6978379acc7ac16095d507a0c8f310499a857617cc`	pdf-javascript-stream	PDF /JS object 9 at offset 0x496	32 bytes

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