PDF malware analysis — malicious · f5286caa580631a2

MALICIOUS

PDF

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

MD5: 1218dfa5ff2755a7edf8a5558d5993f1 SHA-1: 2f14ed8dba095030d52254d91fc6c5687f609ba2 SHA-256: f5286caa580631a2044358e48cee2d1ec0f8399d2cc79eeb6a5dc61d19ab0ad8

70 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains an embedded JavaScript file, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript file, 'stream_001_off0000031f.js', is likely responsible for executing the malicious payload. The document body is largely unreadable, providing no specific lure.

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` `c0c92773dedd1d5ba9c886c557283cb70b7c304a6057138fb374d45cef74d14e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x31F	13475 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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