PDF malware analysis — malicious · 4a608c672b5edfa9

MALICIOUS

PDF

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

MD5: f3c3186ae4e56f0c6d352ef8d9afd533 SHA-1: b9be548c76808abe87e335a1cebef54edd7adfd3 SHA-256: 4a608c672b5edfa9c256f3d44e5fcb28fcc69fe6defbeaeeb0c48cf4ac00cb78

226 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution T1059 Command and Scripting Interpreter T1059.007 Command and Scripting Interpreter: JavaScript

This PDF document contains an embedded script payload, indicated by multiple high-severity heuristics including PDF_UNESCAPE and PDF_XFA_SCRIPT. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded file, 'embedded_file_obj0003.bin', is likely the second-stage payload.

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
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
Suspicious extracted artifact medium 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 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0003.bin` `013a48809a369638eb4bc4429576ae6cd2ab63f362e5a0f7e1a23de04a05ce92`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x12C	36312 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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