PDF malware analysis — malicious · 23d8d60439c7b954

MALICIOUS

PDF

5.2 KB Created: 2012-06-11 17:19:01 Authoring application: TP3

MD5: e3dd5a35d10eab93095cfc729e15b416 SHA-1: c71bb5aa39aab781f1d2a2ec0cd47a328aaa2682 SHA-256: 23d8d60439c7b954e58a21f93f8284f6b044e358f8e703bc1641725950853cab

74 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 'ML_NYX_PDF_MALICIOUS' heuristic and 'PDF_EMBEDDED_SCRIPT_PAYLOAD' rule. This script is likely responsible for downloading and executing a secondary payload, as indicated by its nature and the overall malicious verdict. The embedded artifact 'stream_002_off00000315.js' is the primary IOC.

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_002_off00000315.js` `fda01434bebf5e1280887a332061de45cb6f9083d21f449411c1dffbcf64cd59`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x315	61751 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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