Malicious PDF / .TMP — malware analysis report

Static analysis result for SHA-256 08cec03e42abcfa4…

MALICIOUS

PDF / .TMP

85.5 KB Authoring application: Solid Converter PDF
MD5: d9a50de66f640651130fb051bdf89b72 SHA-1: 67aebd9b3562502ab04995113181e9d3576e40e9 SHA-256: 08cec03e42abcfa456e4ce5cb2a526346e23fa3c048275f9705ea5a08fbfc73d
210 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The critical PDF heuristics indicate the presence of JavaScript exploits within the document, specifically leveraging unescape() calls. The ML classifier strongly suggests maliciousness. The embedded JavaScript is likely designed to download and execute a second-stage payload, a common technique for initial compromise. While specific IOCs like URLs are benign, the exploit cluster and ML score point to a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108a5.bin
aa04ff779405cdf155a2261c4808ac00ed0ad48c86fcb28b9cac7f6a4234b110		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 3763 bytes
polyglot_child_pdf_off0000a06e.pdf
8f611a4ea7f0a790f7ec605de81c614ecd2793565b4911ebebf667c035c09a7b		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xA06E 46432 bytes
polyglot_child_pdf_off00013de1.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x13DE1 6125 bytes

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