Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a9d105d58e8f28…

MALICIOUS

PDF

73.6 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: 002d569f5150cf57cd4854a251162df9 SHA-1: b29dadaa7472d2c9d97fbf7a7c16f00e28b2759d SHA-256: e5a9d105d58e8f28b967c78b173db4c0c7a30a39fe29ed64c6b010b2ed48d0af
208 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV with the signature Pdf.Exploit.Dropped-81. High severity heuristics indicate the presence of eval() calls and risky executable scripts within an XFA form, suggesting an exploit designed to download and execute a second-stage payload. The ML classifier also strongly indicated maliciousness. The embedded file 'embedded_file_obj0010.bin' was noted as suspicious.

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
aa51d4f0ce36c824473c7f0f0a7a75e682bc74378632ae68bb9394cf700c6f83		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x589 72353 bytes
embedded_file_obj0012.bin
6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x12075 389 bytes
embedded_file_obj0014.bin
9f69c42e66b0c1666412737dc9cf4aa42379ee793c4ad8d07130781756ea33d5		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x12244 65 bytes
embedded_file_obj0015.bin
129e4e726ddafc353e13bd03f15fd4d48ceb50aa28924bc8b406e3be1073b46a		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0x122CB 146 bytes

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