Malicious PDF — malware analysis report

Static analysis result for SHA-256 863ba1c39f10ae48…

MALICIOUS

PDF

29.5 KB
MD5: f9858068cb09555f3d8099bfd887f35c SHA-1: 2c009fe196f3add9e5eee1760bf8f7a4a6c27f04 SHA-256: 863ba1c39f10ae487fdec3526f016b04c30ca8bec20c3270853fab145e3d27d5
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by multiple high-severity heuristics, including ClamAV detection for 'Pdf.Exploit.Agent-35955', indicating it contains a known exploit. It also contains embedded JavaScript and RichMedia (Flash) content, identified as 'ursVkUqEkxisV.swf'. The presence of these elements strongly suggests the PDF is designed to exploit a vulnerability, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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
  • 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.

FilenameKindSourceSize
ursVkUqEkxisV.swf
c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0xC17 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
08993fc86d43b429d04bba6f3f8faafe4e7b78c64789da518429d288d80c818c		 pdf-javascript-stream PDF /JS object 6 at offset 0xEC 2038 bytes

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