PDF malware analysis — malicious · 242dbfd2a3e3cec4

MALICIOUS

PDF

4.8 KB Authoring application: zsrb

MD5: ef55512bedf4135e46ac7c17781eec07 SHA-1: a8adc206ea9f6207dced9d8eeeb6444642243948 SHA-256: 242dbfd2a3e3cec416a35eccc19b745675f1153b86808c8928490459ae0a55e1

72 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains an embedded JavaScript file, identified by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. The ML classifier strongly indicates maliciousness. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic which noted a long encoded blob. The primary IOC is the embedded JavaScript file itself.

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_off000002b4.js` `146f4bd4bec7bbb4ac3869af5a45d940af7534f57d8e4314e08ddf9823fc58ec`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2B4	42656 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).

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