Malicious PDF — malware analysis report

Static analysis result for SHA-256 8956d9c68b15be95…

MALICIOUS

PDF

44.5 KB
MD5: 374e8905e2907646882e94a889cae4ad SHA-1: fbbe31440dd19036052c0b99907ff7aaeda3dc9d SHA-256: 8956d9c68b15be95c6ead71c2a5edab7567601533a78fcbecf51fa16cf40e5f5
116 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Dropper.Agent-1506683' and a machine learning classifier assigned a high probability of maliciousness. Heuristics indicate the presence of embedded JavaScript, which is often used in PDF-based attacks to download and execute additional malicious content. While the document body is heavily obfuscated and unreadable, the combination of the ClamAV detection and the embedded JavaScript strongly suggests a dropper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-1506683 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-1506683
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
23b3cb0d961976c02f697d5b9a7fe255b6f793b10d17b81399c4890390529005		 pdf-javascript-stream PDF /JS object 7 at offset 0x86E 998 bytes
font_00_sfnt_off000010d1.bin
044efaa0fcddad6a1afc97a6bd112675dff8d542f6a622fb73e7eb17d43d90f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1 65932 bytes

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