PDF malware analysis — malicious · b922fcfa4511fbd3

MALICIOUS

PDF

7.6 KB Created: 2012-04-17 19:53:38

MD5: 22fa3b2a0eb54b2ccd0479633ab81d01 SHA-1: 173993eac668c2a8f8751b78762fb78f478196ee SHA-256: b922fcfa4511fbd333f536505df28e20c9b58f4b1fcde4d7c1451b21ab7b4221

130 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious File T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell

The PDF sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-156969-1' and an ML classifier indicating a high probability of maliciousness. The presence of an embedded script payload and an embedded file suggests the document is designed to exploit a vulnerability, likely leading to the download and execution of a secondary payload, as indicated by the 'embedded_file_obj0008.bin' artifact.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Dropped-156969-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-156969-1
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `bad4b9ac3894a2ad3944e26a3e87841d1d838366a77bc1f1d65b4f42fda5e368`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xBAF	7163 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).

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