PDF malware analysis — malicious · 5b25b0165756976b

MALICIOUS

PDF

31.3 KB

MD5: b92fdb01a036f33ad755edf58b5434ff SHA-1: 73f047524ee0b5145038c48ac3d1b4dba23490ce SHA-256: 5b25b0165756976b60fec2bbedd431ffb77c8b1151e1fa4c5426e3fa079cfced

316 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 eval() calls, indicating an attempt to obfuscate malicious code. This script is designed to download and execute a secondary payload, as evidenced by the embedded SWF file and multiple JavaScript streams. The presence of PDF JavaScript exploit cluster heuristics and ClamAV detection strongly suggests this is a malicious PDF exploiting a known vulnerability.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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.
ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
RichMedia (Flash) high PDF_RICHMEDIA

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

eval() found — commonly used for obfuscated exploit execution
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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`NyaAdOamKuiRism.swf` `c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x133F	26774 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `108f518a1ad2edf00e5186f146a83cba698fc8a0f1035ace2d657f081a188e9f`	pdf-javascript-stream	PDF /JS object 6 at offset 0xEC	3864 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0006_001.js` `c63751b0af4bc3962d10a97d8837918a4d45e5f4e16d865f0eeb732fa1f541eb`	pdf-javascript-stream	PDF /JS object 6 at offset 0x10C	31819 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `287be94095da95d458c8335ecdef698b3e3e470f95bb830431e1443d3ca0cd12`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0xDBD	2492 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `71f4ad4cfc3b8d355348e436f24334b79fd105210b04e2d8815a843d10e90059`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0xDDD	30275 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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