PDF malware analysis — malicious · b83522a7c1485272

MALICIOUS

PDF

5.0 KB Created: 2011-04-05 23:46:28 Authoring application: sab

MD5: bd435a22b4dc27e632c6f8babff580d5 SHA-1: e7b0dd988daa8ce6ee262c4b5c0932f962a98de6 SHA-256: b83522a7c14852720634883e7aece4eec3d75bf974d5e1ac7f80392971d65957

70 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF was flagged as malicious by an ML classifier with a high score. Static analysis identified an embedded script payload within a decompressed stream, suggesting it is designed to download and execute a secondary payload. The embedded artifact 'stream_001_off00000302.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_off00000302.js` `c55517c3a42d4f899b487f6e3bce2e7577f05e9057c320dc3e76f90368d6d3ac`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x302	55237 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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