Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82f1b894bb75bfa…

MALICIOUS

PDF

52.1 KB
MD5: ba989cf4a9af05df0496e615cc311c3e SHA-1: 7640b27aa4ee516bb7de6a1a3778fe650197fa6c SHA-256: a82f1b894bb75bfa9978bb89f5130da3ec9534e18e01eb668099573611b59fc5
248 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and triggers multiple high-severity heuristics related to XFA forms and script execution, including PDF_EVAL and PDF_UNESCAPE. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded script likely attempts to download and execute a second-stage payload, as suggested by the 'Pdf.Exploit.Dropped-78' ClamAV signature and the presence of an embedded file artifact. The document body content is not directly indicative of a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 9

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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.
  • 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/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
653d636d97262e65ef8446472bdd4b3230423c854f2c55a3f95b225fe6375454		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 52620 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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