PDF malware analysis — malicious · 5b56b50051fbe020

MALICIOUS

PDF

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

MD5: 20c27e3df9f22de3985546c86c9411b1 SHA-1: 4a02852930ef1eaf6e2d52aebda18d7e4ffec835 SHA-256: 5b56b50051fbe020d8f382fabda54037bd254f8a72d2af4e83d13e04855a2b0b

198 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains XFA forms with executable scripts, flagged by multiple high-severity heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded files, particularly 'embedded_file_obj0010.bin', suggests the PDF is designed to drop and execute a secondary payload, likely exploiting a client-side vulnerability.

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 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
Embedded script payload in PDF stream low 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.
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` `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` `f375045eeed19d98d837b59fb1b98783b80dfb3f5e68a068478e743a5bc792a6`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x589	72492 bytes
`embedded_file_obj0012.bin` `6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x12100	389 bytes
`embedded_file_obj0014.bin` `9f69c42e66b0c1666412737dc9cf4aa42379ee793c4ad8d07130781756ea33d5`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x122CF	65 bytes
`embedded_file_obj0015.bin` `129e4e726ddafc353e13bd03f15fd4d48ceb50aa28924bc8b406e3be1073b46a`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x12356	146 bytes

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