Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c020edb3cec1407…

MALICIOUS

PDF

19.4 KB Authoring application: Fslvfukk Yyxilhuplauwvqfd
MD5: 1678a9f27397ce25b5481f2f8d9e4466 SHA-1: d38c615e80cf2c6edad89f5b8d3c4b442a1fb12d SHA-256: 0c020edb3cec1407368ba5521f2ab590ceb2a6a68089c10158408c35897c05f9
168 Risk Score

Malware Insights

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

This PDF document contains XFA (XML Forms Architecture) which is known to be a vector for exploiting PDF vulnerabilities. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded script, likely JavaScript given the PDF context, is designed to download and execute a second-stage payload from the provided suspicious URL, which is a common dropper technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.Dropper.Agent-7227648-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7227648-0
  • 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://remzd.fgsdrill.it/7VpT43_0R5d_v0CZVZ0h_1tF0H_H18/0UgVr0/bAbt0oM3-V0/LEU/H0e1/2K13UyD0-9rav/175kT-0So8b0/Vsiq0hnZ_003j-PF0t2-LN18-e6I/09j7M14_yUu0nMA-e0Sb_1w0i_Md-E0B/4ia0-kGL6_05Ah_s0X/AcO0_RvMd0/6nPN0g-Iee0Uk_0Q_13/gZc0wKOs0o/1mR147X_n0x8pQ/0bXD3_0Q-8id0xv_Xn0MF-Cn0rVz_o0uRw-M0W-CaI0X_3Fz0NoDk-0BwDY_0VGv_V06T/5u05VNk0XI-S3_0B_Lyq0q_3VO11x-8J0or/Be0i5I-R0_NpeN/0c9Y-504Ry-p/UVe4HIMmjV.exe?YXvEUlK672Ygz=RX3T&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
77e06f4c7cf7bd39abe7a3d0c8905ed47a9c2dd84ddd75560a301c6d6e940291		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x1867 12775 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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