Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e106e7f6cad166…

MALICIOUS

PDF

18.7 KB Authoring application: Xfkkbvxfocqaqfg Eqbypkuphrm
MD5: ca5b771e461aca90e12beeaf3ec73e10 SHA-1: 00608b2db220ea7c6c283e3463bdec847178a7f0 SHA-256: 72e106e7f6cad16607527eeb823914f83cba77ac95952c441cc9836a196e796f
108 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF document utilizes XFA forms and embedded JavaScript to execute malicious code. The script is designed to download and run a second-stage payload from the provided URL, which is a common technique for delivering malware. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 8

  • 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.
  • 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
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
  • Embedded script payload in PDF stream low 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.
  • 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.
  • 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://murdoqu.biz/8vFa-v10G5_ND0hu0D0i-2lL0/Q3Gp14p/6O0/8Yil05_1TQ0/33kn08l_fg0Ixr107_SR-I0DSaa/0qI1z0lA-8k0Z/oB50ud/m90Oz_yb03h0_F0TgIx0_dc_y70i5v/K09Wx90aF-MO0A-22u08_Sz-O0uXH0/0eQZ3/0xcIa0_8A790D_N8y0/09c_L0DvY2-0drUJ14/fuP04Ab/70n-zEi03Va/e0UDdp/0Wl0_C0h_DQA13zQ10-GCO20V1/4T0mmDT153c_s0n-xbH0p-tYY0R/7xM0_BTeD/11Afz0Z0/2g0PUM-Z0o_6nh/0zCrX0lVr-9/AksSo5FUoC.exe?5aUbYVm77FbAlN77Ie=bETtl0nSTDjK&quot
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
e334b5d7468b7a45bf598b3c2cb75d973f9fad7aff3c4efc15a0d038ee9654ab		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x14F 12114 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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