PDF malware analysis — malicious · 221d1d2494f98629

MALICIOUS

PDF

7.8 KB Created: 2012-04-27 17:25:24

MD5: 1496e0436455b1ea8112ae8a538eaf33 SHA-1: 61540cde4a7e1c7202a7c5f323a6de4818a902ba SHA-256: 221d1d2494f98629836cd0371c73e0a14ee56357ded1b509b5897827af419e82

128 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-156969-1'. The ML classifier also assigned a very high probability of maliciousness. The presence of an embedded script payload and an embedded file suggests the document is designed to exploit a vulnerability and download a secondary stage. The document body contains seemingly random text, indicating it is not intended for human consumption but rather to obscure the malicious content.

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_obj0010.bin` `67231714a9e3c16218c3e763532c18178dc875787adfdd79e1f2512ef90c2709`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0xCB8	7229 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).

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