PDF malware analysis — malicious · 58b4a963e3dba87c

MALICIOUS

PDF

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

MD5: 98f1a611a1c6c1a05841602787ee37d1 SHA-1: 7776ebb54cd593806b3e1cda6dc3c98035c0f05d SHA-256: 58b4a963e3dba87c031a3b11f8f293ef2f1f6a92784ea8b7c25b18b6f607401d

70 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The PDF file was flagged as malicious by an ML classifier with high confidence. Static analysis identified an embedded script payload within a PDF stream, which is further supported by the extraction of a JavaScript file named 'stream_001_off00000316.js'. This embedded script is likely responsible for the malicious functionality, potentially downloading and executing a second-stage payload.

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` `81eb4e815ff3bfbd890a518badeac10f4aae0a424e1c9571feea45a0a0467a52`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x316	56137 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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