PDF malware analysis — malicious · 23512b740df0e504

MALICIOUS

PDF

5.1 KB Authoring application: sarb

MD5: 9afef7fb992c345c2cdea3fdfaba4787 SHA-1: c332553e71c096113bd10e804b46c8029ac80d38 SHA-256: 23512b740df0e504a7e1e40e67555b7e2b5e53f2692da1ac826995ea465b2b9e

70 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The file is identified as a malicious PDF by ML classification and heuristic analysis, specifically flagging an embedded script payload. The embedded JavaScript file, stream_001_off000002e4.js, is the primary artifact of interest. While the content of the JavaScript is not fully detailed, its presence within a malicious PDF strongly suggests it's designed to execute a secondary-stage payload, likely involving further obfuscation or download of additional malicious content.

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_off000002e4.js` `5d50df1cf1aa8a5eb6e1f8e9415171716518becea2774065d3f78911e303b760`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2E4	62137 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).

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