Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06629e2b42bd977…

MALICIOUS

PDF

47.7 KB
MD5: 6f78edb94a21e422d9e7d5cb3ce31522 SHA-1: 16f435715efd4e156de92b7c61c0e72997e0bee6 SHA-256: b06629e2b42bd97767ee79cc1c46a806880b293743bed5d5254e7eb2b90af62a
158 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including a specific indicator for CVE-2018-4990. The ClamAV detection 'Pdf.Dropper.Agent-7293706-0' suggests it acts as a dropper. The embedded URL points to a potential second-stage payload, indicating a download and execution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7901

Heuristics 7

  • JPXDecode + active content — JPEG2000 CVE-family indicator high CVE related PDF_JPX_CVE_2018_4990_RELATED
    PDF uses /JPXDecode (JPEG2000) alongside JavaScript, XFA, or RichMedia indicators. This matches the delivery pattern for Adobe Reader JPEG2000 parser exploit families, including CVE-2018-4990, but does not prove the exact malformed JP2/JPX primitive.
  • ClamAV: Pdf.Dropper.Agent-7293706-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7293706-0
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000444.js
338d5d65cd2786281c79b2109866d0e437f1650d377a2cc35dedc98b549e02a7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x444 16894 bytes

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