Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab95d673f083ba59…

MALICIOUS

PDF

92.8 KB Created: 2010-05-12 08:54:08 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0) First seen: 2013-10-02
MD5: 81aeebbf59bf61cd3e34d9e5c88297e9 SHA-1: 6e8d4f458cfe83daaad560ad3ddd2fd272fe92fd SHA-256: ab95d673f083ba59f6270a7bbf545263671d1f712d222860f0d1c22fac46ea6e
290 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2009-4324, a known vulnerability in Adobe Reader. The JavaScript is obfuscated but static analysis indicates it likely downloads and executes a second-stage payload. The presence of multiple embedded PDFs and suspicious streams further supports a multi-stage attack. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 5

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: 2c5756757b18f4d8de5a181bb39e2baa677ea5d9f5a6e501d8fa513bd34df6eb
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
polyglot_child_pdf_off00012211.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x12211 20818 bytes
SHA-256: 522d45cdfe7a7c7a47b9ea51bebdae0068e030f355aacb14320ee93a150f95c5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
polyglot_child_pdf_off00015b76.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x15B76 6125 bytes
SHA-256: 0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8

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