PDF malware analysis — malicious · b64050f21233597e

MALICIOUS

PDF

5.0 KB Authoring application: saerb

MD5: 99de01dc3205a34f1eef15022bd42e32 SHA-1: a83ebe57cea124c78bfc5bf4463f62946794af41 SHA-256: b64050f21233597e7083c1272f236fb29189dfdb2ead02b1623a2db9cffa582b

70 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains an embedded JavaScript payload, identified as 'stream_001_off000002ea.js'. This script is likely responsible for downloading and executing a second-stage malicious file, which is a common technique for initial access and further infection. The presence of an embedded script payload and the ML classification strongly indicate malicious intent.

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_off000002ea.js` `927573e944f4d2e9a7c4f37f68ca8b39de19d2a95cb36ae6ca6d1cd6e75f124d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2EA	59231 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).

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