PDF malware analysis — malicious · e5915cac09605405

MALICIOUS

PDF

5.2 KB Created: 2012-06-11 17:19:01 Authoring application: cUG

MD5: fbd0ba477c7d5c544fda0fb9996db803 SHA-1: a8ac5964ee912b8a2a25c83fddf86babe45a8a3f SHA-256: e5915cac0960540579048628bf16f82c233894b2d9c55b10fcdcfde849b6c648

72 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 with high confidence. It contains an embedded JavaScript file, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. This script is likely responsible for downloading and executing a second-stage payload, as suggested by the 'ML_NYX_PDF_MALICIOUS' and 'EXTRACTED_FILE_STATIC_TRIAGE' heuristics. The presence of an embedded script points towards a delivery mechanism for further malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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_off00000315.js` `4ad46f8dd97dcbf7632175de8f174fbe0f274b6251b11b98df0fc5e6330daaf1`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x315	61520 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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