PDF malware analysis — malicious · 4d534b434d4de046

MALICIOUS

PDF

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

MD5: f0e93e2feef87349d8770b90fd6bb14b SHA-1: 67bd0668c06823b152af9b7c8463d352b2434c72 SHA-256: 4d534b434d4de0461b677f7df33f992a83db48e0289f89fe507b5ff3eee6416e

70 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 and the presence of 'stream_001_off0000031f.js'. The ML classifier strongly flagged this PDF as malicious. The embedded script is likely designed to download and execute a second-stage payload, contributing to the overall malicious nature of the document.

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` `89083083855a79426a4b1c1fcd0c773eb72c6de1be6b16c3de646ed1208e6a5c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x31F	12779 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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