Malicious PDF — malware analysis report

Static analysis result for SHA-256 23511f30e3c850e3…

MALICIOUS

PDF

46.9 KB Authoring application: 152,214,207,153,173,221,182,208,211,205,174,215,166,217,222,169,171,148,204,168,173,169,198,171,220,216,210,173,143,168,186,176,187,148,166,215,198,187,149,206,215,221,149,171,155,177,185,211,201,216, (via 132,143,132,208,205,210,207,159,110,109,218,197,214,132,216,205,202,202,195,200,197,216,197,132,161,132,134,183,185,207,213,165,168,203,203,165,165,134,159,110,109,109,216,205,202,202,195,200,197,216,)
MD5: f8cdef7b9fd784d06c51ce95ab58e3f0 SHA-1: 031c5e3e0c96675f2e0b9d9e5ec12e3a58e56bb9 SHA-256: 23511f30e3c850e30eed3dd5c98dff15ade303205a67fe5d7303b81ee55da95f
124 Risk Score

Malware Insights

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

The PDF file contains XFA form elements with executable scripts, flagged as risky. The ML classifier strongly indicates maliciousness. An embedded script payload was detected, and an artifact named 'embedded_file_obj0042.bin' was extracted, suggesting it's a component of the attack. The script's likely intent is to download and execute a second-stage payload, which is a common technique for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0040.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 40 at offset 0x9668 85 bytes
embedded_file_obj0041.bin
751ae4cbe7a6f4f8a120d4187030e9762fd99422734a0d40ffcd2994656557f9		 pdf-embedded-file PDF EmbeddedFile object 41 at offset 0x971A 1339 bytes
embedded_file_obj0042.bin
4b624af0e39058f86ebbba3b9d837ff3b8095046a7c7afa38ea52901d3fa1d60		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x99AD 2771 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
embedded_file_obj0043.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 43 at offset 0x9F3D 144 bytes
embedded_file_obj0044.bin
ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x9FFF 2427 bytes
font_00_cff_off00003751.bin
23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0		 pdf-font-stream PDF embedded font (cff) at offset 0x3751 31178 bytes
font_01_cff_off0000a3cf.bin
b13fc890607bb68dff168ca9f3dccbb22dbf757cb8b12fdad10a9cd802257f00		 pdf-font-stream PDF embedded font (cff) at offset 0xA3CF 1192 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.