PDF malware analysis — malicious · 6dfb1d99438a190b

MALICIOUS

PDF

7.1 KB

MD5: d11dacdd298795edbf5db1ada62cf0fb SHA-1: af61f1007fffc340bb4922b204049468f0960752 SHA-256: 6dfb1d99438a190bf6bc8108309e767536d07ed759698e17a04a887c9fcd549e

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that utilizes unescape() and heap spraying techniques, strongly indicating an exploit. The embedded 'exploit.swf' file and the JavaScript's heap spray function suggest the PDF is designed to exploit a vulnerability, likely for client-side execution of a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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
`exploit.swf` `49b04eca9be01c285a55c8ebf6d33b686ebd88925f5f524951dc74928b300173`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x48C	3764 bytes
`javascript_obj0017_000.js` `8eca89d8ba6e05341cab405be7afbaad22ca6cec35b6077639ff64105a9887c8`	pdf-javascript-stream	PDF /JS object 17 at offset 0x13F4	1674 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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