Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77aa797b98d7a33…

MALICIOUS

PDF

70.5 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: 2e3074ba5d5b8acfe75949b805b9ae9d SHA-1: ccbde97e31fa2994033cb30fed1815bf16a059ce SHA-256: d77aa797b98d7a335847a02e4d4664d30444fe511978c8d4871e727a5e90b98a
208 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1059.001 PowerShell

This PDF file exhibits multiple high-severity heuristic firings related to embedded scripts and XFA forms, strongly indicating malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, identifying it as Pdf.Exploit.Dropped-81. The presence of embedded files and script payloads suggests the document is designed to exploit vulnerabilities and download a secondary stage, although the specific script content is not detailed enough to reconstruct precise actions.

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
10524c8841105d398f3e8e8c790bc322eaa76a0f71d67929337ac5d9e1752e52		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 815 bytes
embedded_file_obj0010.bin
0daf333234b77c81f41e69f690cf08f48298b27142f8f6fef5701b67f5fb50af		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x4DC 101 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0011.bin
73510f3355b1352a5679d2dc78abd68a82b0c3b29c7b86a54f154223b8b9324a		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x58C 69215 bytes
embedded_file_obj0012.bin
6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x11436 389 bytes
embedded_file_obj0014.bin
9f69c42e66b0c1666412737dc9cf4aa42379ee793c4ad8d07130781756ea33d5		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x11608 65 bytes
embedded_file_obj0015.bin
51d6d76eddb1746e412f89f4d1c1b0d620c60fb4a5641c018e93871be63968a9		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0x11693 147 bytes

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