Malicious PDF — malware analysis report

Static analysis result for SHA-256 672ca0460dec9f02…

MALICIOUS

PDF

45.2 KB Created: 2012-05-20 15:19:21 +04:00 Authoring application: Adobe Designer 7.0
MD5: 5f61879610f025089ea69863588e19b2 SHA-1: 893372f3d720f9c0da7033c17bbd10f23aa961e5 SHA-256: 672ca0460dec9f0232ebe95f225fb3630a985a992e97bd982fc79cfe55f166cd
114 Risk Score

Malware Insights

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

The PDF utilizes XFA forms and embedded scripts, flagged by high-severity heuristics, indicating a malicious intent. The ML classifier strongly supports this assessment. The embedded script likely attempts to download and execute a second-stage payload, as suggested by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'PDF_XFA_SCRIPT' firings, and the presence of an embedded file artifact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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)
  • 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.
  • 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/
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.1/
    • http://www.xfa.org/schema/xfa-template/2.2/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://www.xfa.org/schema/xfa-locale-set/2.1/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0042.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x832F 85 bytes
embedded_file_obj0043.bin
33d092314923d6613901968dd4e30dc810c707195e5d9a0375aef4fc9cde5559		 pdf-embedded-file PDF EmbeddedFile object 43 at offset 0x83E1 1185 bytes
embedded_file_obj0044.bin
de9a1a4701cee8c2271f34c6a0c479530cd07c27b841a713ec7f17e6afbd2f16		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x8636 12463 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_obj0045.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x94D0 144 bytes
embedded_file_obj0046.bin
ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd		 pdf-embedded-file PDF EmbeddedFile object 46 at offset 0x9592 2427 bytes
font_00_cff_off0000134b.bin
23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0		 pdf-font-stream PDF embedded font (cff) at offset 0x134B 31178 bytes
font_01_cff_off00009962.bin
59a5cc9ef85d6aaa75060415fa7f135dd4103a8f487c16379a1ad86dd7bc1387		 pdf-font-stream PDF embedded font (cff) at offset 0x9962 2098 bytes

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