PDF malware analysis — malicious · af51ef4e8abb5b29

MALICIOUS

PDF

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

MD5: 9c5330ba03667b54f4227fd865ed5355 SHA-1: 817dab15bc541453dea0d7b9bb605a49e85c633a SHA-256: af51ef4e8abb5b2914f894811a9bd0ad6f773f92a365bbdede1ba7be3bb6e6a0

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059 Command and Scripting Interpreter T1566 Phishing

This PDF file was flagged as malicious by multiple heuristics, including PDF_XFA_SCRIPT and ML_NYX_PDF_MALICIOUS, and detected by ClamAV as Pdf.Exploit.Dropped-81. The presence of an embedded script payload within an XFA form indicates an attempt to exploit vulnerabilities. The embedded artifacts, particularly embedded_file_obj0011.bin, suggest the delivery of a secondary stage. The attack pattern is consistent with a phishing lure designed to exploit PDF vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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
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 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 0xDB	67 bytes
`embedded_file_obj0009.bin` `6b2260d3c78649345d3f0b850b831d545d33bb7017ccdf438cdfe1e9db7f2db2`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x167	294 bytes
`embedded_file_obj0010.bin` `5e850bba2a6c7be42461e665b5e82373d78214d7f5824a662d2da07c8d57b4cc`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x2D8	504 bytes
`embedded_file_obj0011.bin` `2a528080bac44f44cd8225d8727f77b8fabab59f6d32f3c8f0b21ee0e49440bf`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x51B	23128 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0012.bin` `103d1e7983cf88bfacedddb4af33ffb5317d9c2c8b3e1bfd987b2c5d712bc985`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x5FBE	323 bytes
`embedded_file_obj0014.bin` `6a34b324794c506fbd6dbfa05a2e584bfc5348352bd53c09255137659edd58cc`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x614B	165 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 0x6236	77 bytes
`embedded_file_obj0016.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x62CA	56 bytes

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