PDF malware analysis — malicious · efdefe18df902794

MALICIOUS

PDF

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

MD5: aa5569307d8ad9d9a86b7974e1fe1777 SHA-1: c4c7cdb06c8a9714d8c7ab6bafda278eac9a361b SHA-256: efdefe18df90279449d52a841b621c65fa03152bafeaf2cb41232a1f407c9d03

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 script payload. The embedded JavaScript, named 'stream_001_off00000316.js', is likely responsible for downloading and executing a second-stage payload, which is a common technique for initial access and further infection. The presence of XFA forms and embedded files further supports a malicious intent.

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` `246bc3819ddcc510b9c65abea55eb1ad3b4c9aacc71dc289bbd657cbf98a0059`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x316	55497 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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