Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35acaa4b8575157…

MALICIOUS

PDF

18.4 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: a201fa1a75c477a07c23c98c0c251bc6 SHA-1: d01f886e192ab860c66794ed48e7e97d376bc8b2 SHA-256: f35acaa4b8575157f55a935d726b9841787a574221b2e4c6a1e6ff5e6ff87ca4
208 Risk Score

Malware Insights

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

This PDF file exhibits multiple high-severity heuristic firings, including PDF_EVAL and PDF_XFA_SCRIPT, indicating the presence of executable script content within an XFA form. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded script is likely designed to download and execute a secondary payload, as indicated by the 'Pdf.Exploit.Dropped-81' ClamAV signature and the presence of an embedded file artifact. The attack pattern is consistent with a malicious PDF dropper.

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
e063279dc64f45e5fd8a3e0c526c1f12714d24c89fe2177d00853ac78ad43650		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 781 bytes
embedded_file_obj0010.bin
9e22ae248b84e1687a0129c0f1bf301d348d22522b1688ac09e97ea9d49f2f42		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x4BA 144 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0011.bin
b46255ee39231ca77c9b19d6870f82386dc66d7b4e2c21e5bcae3a2c80b2679e		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x595 15833 bytes
embedded_file_obj0012.bin
6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x43B9 389 bytes
embedded_file_obj0014.bin
9f69c42e66b0c1666412737dc9cf4aa42379ee793c4ad8d07130781756ea33d5		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x4588 65 bytes
embedded_file_obj0015.bin
129e4e726ddafc353e13bd03f15fd4d48ceb50aa28924bc8b406e3be1073b46a		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0x460F 146 bytes

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