PDF malware analysis — malicious · 5684839bd1741cac

MALICIOUS

PDF

4.9 KB Created: 2011-04-05 23:46:28 Authoring application: bufdb lsdfob

MD5: e0d1193b5707027cd4eb76d6f7a84ff6 SHA-1: 3ca35b4f6c7cb0f0711ac3630f826fe6d4d95172 SHA-256: 5684839bd1741cac4a39fa33e0282e07ea470037130feec21607695d71110761

72 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains an embedded JavaScript payload, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript, named 'stream_001_off0000031f.js', is likely responsible for executing the malicious action. The exact function of the script is not fully discernible due to potential obfuscation, but its presence and the high ML score suggest it's designed to exploit a vulnerability or deliver a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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
`stream_001_off0000031f.js` `77a2b0ab7934a7172b539592a997afa261bf578617b0e974067bc3f561e98566`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x31F	13295 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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