PDF malware analysis — malicious · 15ff2921c7018b50

MALICIOUS

PDF

4.9 KB

MD5: eec431bafa35d35f29521377ede9056a SHA-1: 274feb77c60d297bf8770cf2a43edec7123f3048 SHA-256: 15ff2921c7018b5086769e344dcca409861de86b25f0261d9e090f969b5562bd

196 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that utilizes unescape() and constructs a large string of unicode characters, indicative of an exploit attempting to overwrite memory. The presence of an embedded SWF file further suggests a multi-stage attack. The script's primary function appears to be preparing for and executing an exploit, likely to download and run a second-stage payload.

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` `9b9c21b9e7c2489645f2d8100489597d5459730292cebc9619b96404a112ac80`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x4D4	1503 bytes
`javascript_obj0017_000.js` `6c4c288717ee189d0486a6e20d81fed107bcca7186d05954b3bdc069be8b026f`	pdf-javascript-stream	PDF /JS object 17 at offset 0xB67	1659 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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