Malicious PDF — malware analysis report

Static analysis result for SHA-256 8053af6cd3d00786…

MALICIOUS

PDF

40.4 KB Created: 2012-05-21 15:17:25 +04:00 Authoring application: Adobe Designer 7.0
MD5: 220ddbbeafd2619fb68e71f709ec0910 SHA-1: dddd1d97b7813dea4bb67a02dc102fbeb3c389a3 SHA-256: 8053af6cd3d00786600acdc9924e23032a377583ab41d15b05c57e3dee93a743
146 Risk Score

Malware Insights

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

This PDF document contains a malicious XFA form that triggers an embedded script. The script is designed to exploit a vulnerability, likely leading to the execution of a second-stage payload. The ML classifier strongly indicates malicious intent, and the presence of an embedded file further supports this assessment.

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 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
  • 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_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
dc63d6658c08809a81081c318b51aa7f2aad0fb858094dd18358bca33a30496e		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x74BA 59687 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 0x84FC 144 bytes
embedded_file_obj0044.bin
ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x85BE 2427 bytes
font_00_cff_off0000126e.bin
23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0		 pdf-font-stream PDF embedded font (cff) at offset 0x126E 31178 bytes
font_01_cff_off0000898e.bin
23b8b30e11470dd1ba6a3654d6ba1295fafa50e0fef4ed7956d19f35b61d0f9f		 pdf-font-stream PDF embedded font (cff) at offset 0x898E 1192 bytes

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