Malicious PDF — malware analysis report

Static analysis result for SHA-256 113a13e5f65632df…

MALICIOUS

PDF

89.2 KB Created: 2008-02-14 17:33:19 -03:00 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)
MD5: 9bcfe3317349343ec4ade6424059d629 SHA-1: fbe79d8145ac03430ff46f672128395e854f6bfc SHA-256: 113a13e5f65632df881f38e4a16bece0037a497ed38c37ee969fa2c46ec75ff9
312 Risk Score

Malware Insights

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

This PDF file exploits CVE-2009-0927 using embedded JavaScript. The JavaScript code, after deobfuscation, appears to be designed to download and execute a second-stage payload. The critical heuristic firings and ClamAV detection strongly indicate malicious intent, likely as a dropper for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 10

  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (matched in decompressed stream)
  • 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.
  • ClamAV: Pdf.Dropper.Agent-7230258-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7230258-0
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
    Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
  • 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.
  • 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://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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0036_000.js
63bbb2d19297ca0cd7b0f903ae45c881d68c58630880431144fcac6837733a17		 pdf-javascript-stream PDF /JS object 36 at offset 0x2125 4096 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
generic_stage_recovery_000.js
4bfedec38dadea78f8b2341b46cc1c3e4792204c848f30876113ce5d2ffefa08		 deobfuscated-js generic stage recovery null-collapse from JavaScript object 36 at offset 0x2125 3579 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
generic_stage_recovery_001.js
7def0da8c687135b9863f937ab590ea86c484abe67c07d35231d6a87ead49361		 deobfuscated-js generic stage recovery marker-XX-to-%u from JavaScript object 36 at offset 0x2125 3663 bytes
generic_stage_recovery_002.js
844e18647355e1c4c29c21d1c4ef95bc3b8fd25c5eb32182ce4e4bcf16fd1f99		 deobfuscated-js generic stage recovery null-collapse -> marker-XX-to-%u from JavaScript object 36 at offset 0x2125 3146 bytes
font_00_sfnt_off0000d64d.bin
1438a4d561896840134f0c61aad0d01e9a0e677ae7722611c848310809cab1b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 58208 bytes

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