PDF malware analysis — malicious · 36ff8983b546eaea

MALICIOUS

PDF

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

MD5: ca18edaedaa2edbc4155ea0ab4d0c6bb SHA-1: ff5acde6603eb7174b9a292af148e5ed4f9b2ea1 SHA-256: 36ff8983b546eaea4436fc53a7d5e1b477a890a0e5e5d7e060ecc5c9f2136feb

70 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier with high confidence as malicious. It contains an embedded JavaScript file, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. The ML classifier's output and the presence of an embedded script strongly suggest this file is intended to deliver a malicious payload. The embedded artifact 'stream_001_off0000031f.js' is the primary indicator of 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` `73c483aca119355791d04173b62a4d6b9649da7fafe6d3a9f1d3fe1f4faf1de6`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x31F	13258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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