PDF malware analysis — malicious · 4cc57b142132c9f4

MALICIOUS

PDF

5.1 KB Authoring application: sab

MD5: 062dcaf524d85764460d2bfaecdddd6c SHA-1: 79adda0a97f3a8fb037f39c937f9db9f0f647e01 SHA-256: 4cc57b142132c9f46902892f6d7d9045c45ee751a91e1fb4b7aed94558fc78fa

70 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment

The file is identified as a malicious PDF by a machine learning classifier with high confidence. Static analysis detected an embedded script payload within a PDF stream, which is a common technique for delivering malicious content. The presence of an embedded JavaScript file further supports this finding. The exact nature of the exploit or payload is not fully discernible from the provided heuristics and document body, but the embedded script is the primary indicator of 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_off000002e2.js` `91897cd0b6b8d33e8907537c6074e5ebc48ebbaff46e8c771dff83f067f4c683`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2E2	57159 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).

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