PDF malware analysis — malicious · bd663ceb2bc82cb3

MALICIOUS

PDF

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

MD5: 0e3362241e20ca1c0eb71de648e9c2c8 SHA-1: 9626df74e1136348701790ab77dfff8bdc9f3da2 SHA-256: bd663ceb2bc82cb32fef061ff853808f8a4bd6a9a414cf043e3a7911aab51854

70 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, flagged by heuristics as a suspicious script payload. The ML classifier strongly indicates maliciousness. The embedded JavaScript, named 'stream_001_off0000031f.js', is likely responsible for executing the malicious payload, potentially leading to further compromise.

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` `207bd81362970d05bee99fdd7878fcf426ccccb1b4db2e040796f6f00b345c7e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x31F	13261 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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