Malicious PDF — malware analysis report

Static analysis result for SHA-256 9547aa21a92bb610…

MALICIOUS

PDF

73.7 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: f96238fa168bb82f36335c9057986642 SHA-1: 8469e78be78bc5dc9b02a35dd52535245bf44ef1 SHA-256: 9547aa21a92bb610bf38d79cfbd4813198d5e90837ebdca6b049b2ef743a2c1c
208 Risk Score

Malware Insights

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

This PDF file exhibits multiple high-severity heuristic firings indicating it contains malicious content and exploits. Specifically, PDF_EVAL and PDF_XFA_SCRIPT point to the presence of executable script within an XFA form, a common technique for delivering exploits. The ML classifier and ClamAV detection strongly support its malicious nature, identifying it as 'Pdf.Exploit.Dropped-81'. The embedded file, 'embedded_file_obj0010.bin', is flagged as suspicious due to script obfuscation indicators, suggesting it is the delivered payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • ClamAV: Pdf.Exploit.Dropped-81 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-81
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • 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
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD7 67 bytes
embedded_file_obj0009.bin
173bd87906494960aa024c455d44b9a634f56efab750004116b9b7c1ed1590f8		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 790 bytes
embedded_file_obj0010.bin
5d98c2ea191da557e61dfe6adc326252dcdf6dea39a59a0cdb162ec6ee173931		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x4C3 123 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0011.bin
f99739e5c949227df087c6dff004a7a9fcce181c557fa832faea21cb1829e8d1		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x589 72468 bytes
embedded_file_obj0012.bin
6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x120E8 389 bytes
embedded_file_obj0014.bin
9f69c42e66b0c1666412737dc9cf4aa42379ee793c4ad8d07130781756ea33d5		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x122B7 65 bytes
embedded_file_obj0015.bin
129e4e726ddafc353e13bd03f15fd4d48ceb50aa28924bc8b406e3be1073b46a		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0x1233E 146 bytes

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