Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec438e80ac5b84a…

MALICIOUS

PDF

44.7 KB Created: 2012-10-10 16:07:58 +04:00 Authoring application: Adobe Designer 7.0
MD5: be0c694d17d7416d85e19b512e4f8590 SHA-1: edebe43e6a2d22341a5a472b650d0a46cf53b0f5 SHA-256: 8ec438e80ac5b84a0c2d25a08645a97f2714380be453a5b087144238cb1dfa3b
156 Risk Score

Malware Insights

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

The PDF file contains XFA forms and triggers an eval() call, indicating it is designed to execute embedded scripts. The ML classifier strongly suggests maliciousness. The embedded JavaScript, although obfuscated, is likely responsible for downloading and executing a second-stage payload. The presence of embedded files further supports a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (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 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0042.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x7AF8 85 bytes
embedded_file_obj0043.bin
f20aceb8dbc16d07642c756ca1ccc141a87f1f44f1a99949a4c6a6a8678b4c98		 pdf-embedded-file PDF EmbeddedFile object 43 at offset 0x7BAA 1526 bytes
embedded_file_obj0044.bin
1183d8ed653c644fe9d4ab15b60d5561b92a8aee4430a3407a8f789d4302759f		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x7E7A 5567 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0045.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x89C6 144 bytes
embedded_file_obj0046.bin
851068169faaac8fcdfa72571a46fea924d1fb0c33b95225802028dfa0b1c7a7		 pdf-embedded-file PDF EmbeddedFile object 46 at offset 0x8A89 4800 bytes
embedded_file_obj0047.bin
57045217c453d4674a08ad8778674bf199a7989a9505424a1815c016e6bb412f		 pdf-embedded-file PDF EmbeddedFile object 47 at offset 0x8F25 212 bytes
stream_006_off0000740c.js
4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x740C 870 bytes
stream_008_off00007851.js
c876171bd867b66b7671fb337ff9e57d18cd15b43d344cf5a7243821300a408a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7851 1528 bytes
font_00_cff_off00001339.bin
23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0		 pdf-font-stream PDF embedded font (cff) at offset 0x1339 31178 bytes
font_01_cff_off0000908a.bin
b3745fe60ed2b79d33047feb5a279123a26860f718ffc20e4c32f3c7de61af42		 pdf-font-stream PDF embedded font (cff) at offset 0x908A 3875 bytes

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