Malicious PDF — malware analysis report

Static analysis result for SHA-256 24193f07b32d1914…

MALICIOUS

PDF

17.6 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: 73a10d59e91e1cc3ae6eaa5ac1361603 SHA-1: 7c3ff70906a0224bdcfd4420e7ca2b0a6585ca1b SHA-256: 24193f07b32d1914a026f0521b59d0f01fd1257404e4eb26be4e61dfda52444c
186 Risk Score

Malware Insights

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

The PDF file contains embedded scripts and is flagged for exploiting PDF vulnerabilities, specifically using eval() and fromCharCode functions. It also contains embedded files, one of which is flagged as a suspicious extracted artifact. The ClamAV detection 'Pdf.Exploit.Dropped-81' strongly suggests this is a dropper for further malicious content. The primary attack vector appears to be leveraging XFA form vulnerabilities to execute embedded scripts, likely leading to the download of a second-stage payload.

Heuristics 9

  • 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
  • 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.
  • 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
e063279dc64f45e5fd8a3e0c526c1f12714d24c89fe2177d00853ac78ad43650		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 781 bytes
embedded_file_obj0010.bin
67f1098c0eb0a5d9c9f006d930fc936e8147c6cf5de99cb4d969eaa4b082315f		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x4BA 121 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
embedded_file_obj0011.bin
0fe1c881cec4e6e90e514f082ecb68a70c35096d02a320c55a226315da8b492f		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x57E 15034 bytes
embedded_file_obj0012.bin
6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x4083 389 bytes
embedded_file_obj0014.bin
9f69c42e66b0c1666412737dc9cf4aa42379ee793c4ad8d07130781756ea33d5		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x4252 65 bytes
embedded_file_obj0015.bin
129e4e726ddafc353e13bd03f15fd4d48ceb50aa28924bc8b406e3be1073b46a		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0x42D9 146 bytes

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