PDF malware analysis — malicious · 05b79a4435bdcfd7

MALICIOUS

PDF

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

MD5: 08b9900675f803a697574c66cc05c44e SHA-1: 6a338c9813e7c860d0eab7e5baf5542e347b534d SHA-256: 05b79a4435bdcfd7ceaa658cc2878219c1c64b6336b2aa8ba9af761a6fb39076

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 and an eval() call, indicating it's designed to exploit vulnerabilities. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically as a dropper for further malware. The presence of embedded files further supports this, as they likely contain the secondary payload.

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 8

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` `e2e0f6c5cb2e0b2697da89386bfc3718eedaf1b6a2b1d24dd1176d27117bf77a`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x162	781 bytes
`embedded_file_obj0010.bin` `76e71e452338d7384967dbf3b8d5c06bea128714940cb02957dd801959b08deb`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x4BA	87 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0011.bin` `a2c6f59f75c4cea828eb69db2ff5941d25c1e0b40f4f7a6a4a79372cfae24ebf`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x55C	26080 bytes
`embedded_file_obj0012.bin` `103d1e7983cf88bfacedddb4af33ffb5317d9c2c8b3e1bfd987b2c5d712bc985`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x6B87	323 bytes
`embedded_file_obj0014.bin` `9035511eba39b5ffb4bdec81b45c98867875af195e374d460662ede3e9237621`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x6D14	163 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0015.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x6DFD	77 bytes
`embedded_file_obj0016.bin` `78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x6E91	68 bytes

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