PDF malware analysis — malicious · 56cc26217e760c2a

MALICIOUS

PDF

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

MD5: d0b41e87774ad4adbc84236c437616c2 SHA-1: 45f44538379825dfb992c89cd7f6d581b2bd6cee SHA-256: 56cc26217e760c2a06e4dc443276a4b0d9fab93d52cd069e91bdfad9aaf4f9ee

216 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file contains high-severity heuristics indicating the presence of XFA forms with executable scripts and an embedded script payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of a dropped payload from the embedded file. The 'eval' call and 'String.fromCharCode' usage point to script obfuscation and execution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
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` `e063279dc64f45e5fd8a3e0c526c1f12714d24c89fe2177d00853ac78ad43650`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x162	781 bytes
`embedded_file_obj0010.bin` `c71f7bd5f8cfd3d96d0f285ff85e50c0dc94d73f0c5a4ba37eb6fd71317112a5`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x4BA	122 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`embedded_file_obj0011.bin` `fc92a1274e868444585ad7c28a15c6f6f30c08135f3a4911791402bd5f12d2c2`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x57F	18525 bytes
`embedded_file_obj0012.bin` `6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x4E27	389 bytes
`embedded_file_obj0014.bin` `9f69c42e66b0c1666412737dc9cf4aa42379ee793c4ad8d07130781756ea33d5`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x4FF6	65 bytes
`embedded_file_obj0015.bin` `129e4e726ddafc353e13bd03f15fd4d48ceb50aa28924bc8b406e3be1073b46a`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x507D	146 bytes

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