PDF malware analysis — malicious · a4bf28c74b03be75

MALICIOUS

PDF

5.2 KB Authoring application: saerb

MD5: 96f3382580a3eb9dde6d9e9d2912420a SHA-1: a2199b5d7612bf61ed40c04dffb79f7c32b1e4eb SHA-256: a4bf28c74b03be7573f648d630643dfc32d90bc20c7103dc4cf57c1f4f780042

70 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier with a high confidence score. Static analysis revealed an embedded JavaScript payload within a PDF stream, indicating an attempt to execute malicious code. The embedded artifact 'stream_001_off000002e9.js' is the primary indicator of this malicious activity.

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_off000002e9.js` `c12d596f7458ed96ee834482ba589be1602fc5e684b315c7111f4a1ccceb9c83`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2E9	65336 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).

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