Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad65c36011187a8d…

MALICIOUS

PDF

4.8 KB Created: 2011-04-05 23:46:28 Authoring application: bufdb lsdfob First seen: 2013-10-05
MD5: 5307ef8a456ea79b55c3bbc6e6a91911 SHA-1: 50ccca6ed98da4a42dff1340a08297b5a90447c4 SHA-256: ad65c36011187a8d0765990d5b01d4eb942f4ac825e8488cffb7b2cc40e05b43
74 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains an embedded JavaScript file, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. The 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic flags this embedded script as suspicious due to obfuscation indicators. The likely intent of this script is to download and execute a second-stage payload, which is a common technique for malware delivery. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • PDF embedded file could not be fully decoded medium PDF_EMBEDDED_FILE_UNDECODED
    A declared PDF /EmbeddedFile stream uses filters that the scanner could not decode. The raw stream was carved for artifact triage because malformed or unsupported attachment filters can hide payload content from normal extraction.
  • 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
  • Embedded script payload in PDF stream info 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.
  • 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.
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/\ In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.5/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off0000031f.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F 13243 bytes
SHA-256: a3c9c05303aba758816257fd67ea343e6601a27e32b6b5e6b76b69b77c1cc17d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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