PDF malware analysis — malicious · 4d9b6458de2b8035

MALICIOUS

PDF

5.2 KB Created: 2011-04-05 23:46:28 Authoring application: bgsfsdffab

MD5: 991eb162c262f4809932ea60a0ce7238 SHA-1: 2d9bc50be8f066115cab812563aa0a3c85ba5929 SHA-256: 4d9b6458de2b80354a24f94f7fe673c2d77f2869e1f987e6b6f237aef467446c

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 and contains an embedded JavaScript payload. The JavaScript, named 'stream_001_off00000316.js', is likely responsible for downloading and executing a second-stage payload, as indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. The document body itself does not provide clear user-facing content, suggesting the primary malicious function resides within the embedded script.

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_off00000316.js` `89348067267d8271cc3350329dda740188228fe4568c7805d65fce159a241fb0`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x316	56457 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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