PDF malware analysis — malicious · 67d392ae15838b99

MALICIOUS

PDF

6.9 KB

MD5: a7d8f926da96f2025f8db04ac9acf1ff SHA-1: 35f8c5a4617a5016787a335c8aafb643e8cbf86e SHA-256: 67d392ae15838b99c07de1c6490754f933508fc4cd38e4d4c333bfdf6f40c8fb

196 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that utilizes the unescape function, a common indicator of exploit code. The script attempts to spray the heap with a large chunk of data, suggesting it's preparing for or executing a memory corruption exploit. The presence of an embedded SWF file further supports the likelihood of a multi-stage attack. The primary technique observed is JavaScript execution within a PDF, leading to client-side exploitation.

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` `4731323f73020c7554eee81a221fc47122d64f08b035fa11d79902718182840c`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x48C	3628 bytes
`javascript_obj0017_000.js` `8eca89d8ba6e05341cab405be7afbaad22ca6cec35b6077639ff64105a9887c8`	pdf-javascript-stream	PDF /JS object 17 at offset 0x136C	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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