Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c3bceef7ad6aac…

MALICIOUS

PDF

40.3 KB Created: 2012-05-21 15:17:25 +04:00 Authoring application: Adobe Designer 7.0
MD5: bded696cb838b611fcd7c14ca7c318a5 SHA-1: 737f26d0a3f8d24181dde3cd10692e6a66ffa3c9 SHA-256: 90c3bceef7ad6aac78f35fca2dbadcfd51ad2310b4a9b1263d6d153b2249cc2d
156 Risk Score

Malware Insights

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

This PDF document contains multiple high-severity heuristic firings indicating the presence of executable script content and embedded files. The ML classifier strongly flagged this PDF as malicious. The presence of an embedded script payload, combined with XFA form elements and unescape() calls, suggests an attempt to exploit PDF vulnerabilities to download and execute further malicious content. The primary embedded file, 'embedded_file_obj0042.bin', is likely the second-stage payload.

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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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
  • 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 0x7175 85 bytes
embedded_file_obj0041.bin
be1b34acf1e2a53a51c182c5e47f66fa2c21cbf510178e5753bed75e5fb40892		 pdf-embedded-file PDF EmbeddedFile object 41 at offset 0x7227 1341 bytes
embedded_file_obj0042.bin
a91112faaa759801aa2dcf981816a539d0d1fba319a3ab7e5932a500d1959d03		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x74BA 59517 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0043.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 43 at offset 0x84E5 144 bytes
embedded_file_obj0044.bin
ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x85A7 2427 bytes
font_00_cff_off0000126e.bin
23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0		 pdf-font-stream PDF embedded font (cff) at offset 0x126E 31178 bytes
font_01_cff_off00008977.bin
23b8b30e11470dd1ba6a3654d6ba1295fafa50e0fef4ed7956d19f35b61d0f9f		 pdf-font-stream PDF embedded font (cff) at offset 0x8977 1192 bytes

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