Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d648a1c655aa2f…

MALICIOUS

PDF

45.1 KB
MD5: eca09a84b52f6e8d4b61468ed62f6528 SHA-1: 0e83302e4633346207fecaf16731435920dfb8a4 SHA-256: a9d648a1c655aa2fa7ceddd16fdb234d1fb0d3ce9966ce078a37cfcf06b66034
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF sample contains embedded JavaScript and utilizes XFA forms, strongly indicating an attempt to exploit vulnerabilities. The ML classifier and ClamAV detection confirm its malicious nature. The embedded JavaScript likely downloads and executes a second-stage payload from one of the unknown-reputation URLs, which are therefore considered high-priority IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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://www.gfhfghfghfgxfa.org/schema/xci/2.6/fghfghgfhfghgfhgffffffffgfgfgfgffg/
    • http://www.fggggggggggggggggxfa.org/schema/xfgggggggggggfa-template/24444.6/
    • http://ns.adobe.com/xdp/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0011_000.js
373decc2279334fd3a7cc66fff5b41ae40c9486239dd683a995b5fac4332673d		 pdf-javascript-stream PDF /JS object 11 at offset 0xA2E0 3319 bytes

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