Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a21d35acda51c3b…

MALICIOUS

PDF

42.4 KB Authoring application: 110,109,110,109,218,197,214,132,216,205,202,202,195,200,197,216,197,132,161,132,134,183,185,207,213,165,168,203,203,165,165,134,159,110,109,109,216,205,202,202,195,200,197,216,197,143,161,132,215,216, (via 181,189,182,153,203,185,212,152,177,189,170,175,187,208,174,213,165,208,206,178,176,206,219,170,187,210,184,148,217,169,208,174,175,203,167,176,143,213,157,149,154,211,202,143,154,219,212,202,217,201,)
MD5: 9a7bc2047ad9c7a6385b9412dbb87ac8 SHA-1: f04dd24d2568fcae4f3ff488e8f5375ea6760f14 SHA-256: 4a21d35acda51c3bbb91afc5a48c11320d9ba62040751df4350198aeedcf22a8
124 Risk Score

Malware Insights

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

This PDF document contains a high-risk XFA form with executable script, flagged by ML classifiers as malicious. The embedded script payload, likely responsible for downloading and executing additional stages, is the primary indicator of malicious intent. The presence of an embedded file, 'embedded_file_obj0033.bin', further supports the payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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
  • 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. (matched inside decoded stream)
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0031.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 31 at offset 0x8E0B 85 bytes
embedded_file_obj0032.bin
9a178fb5a7ee0dfa95a56d18d676e9b6dd3d868e161bf6037bbd08ee7648a36b		 pdf-embedded-file PDF EmbeddedFile object 32 at offset 0x8EBD 1382 bytes
embedded_file_obj0033.bin
fcf4b4a50827f5e8f0e2669630f32f06d8777d165243efdd6412377ddfc01867		 pdf-embedded-file PDF EmbeddedFile object 33 at offset 0x9158 1497 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0034.bin
cd9fb4d7d969d11f5f7b17a502bd4b81e09f8e9f1aed37add3b55bbab3610f78		 pdf-embedded-file PDF EmbeddedFile object 34 at offset 0x9475 2276 bytes
embedded_file_obj0035.bin
0daaacc12bba01c01f9be2749f00d4e6a3ecc23490add5146a29dac3a3c0a1ee		 pdf-embedded-file PDF EmbeddedFile object 35 at offset 0x9762 166 bytes
font_00_cff_off00003254.bin
23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0		 pdf-font-stream PDF embedded font (cff) at offset 0x3254 31178 bytes

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