PDF malware analysis — malicious · 3999eae9680da9b7

MALICIOUS

PDF

18.4 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap

MD5: d7e39953e6bb384383628228395e25ce SHA-1: adb904d621713b45abbc986efed94532d2466499 SHA-256: 3999eae9680da9b791ae46b489c41f4d86b3669f7ea000b519abf4fb64308fe1

208 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains high-severity heuristics indicating an embedded script payload and an XFA form with risky executable script. ML classification and ClamAV detection strongly suggest malicious intent. The embedded script likely downloads and executes a second-stage payload, as indicated by the 'Pdf.Exploit.Dropped-81' ClamAV signature. The document body is minimal and does not provide further context on the lure.

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.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xD7	67 bytes
`embedded_file_obj0009.bin` `984a346671265f638e28c6f18a78a6dac023cc310f32d8ad0ab6a680d4c92579`	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` `1ba230c91e97ca4ca01bd29241daf31bfaf6e2ef4b7529def6f8dfe2cb020734`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x595	15820 bytes
`embedded_file_obj0012.bin` `6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x43AC	389 bytes
`embedded_file_obj0014.bin` `9f69c42e66b0c1666412737dc9cf4aa42379ee793c4ad8d07130781756ea33d5`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x457B	65 bytes
`embedded_file_obj0015.bin` `129e4e726ddafc353e13bd03f15fd4d48ceb50aa28924bc8b406e3be1073b46a`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x4602	146 bytes

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