PDF malware analysis — malicious · c5ddcb56e4e4f804

MALICIOUS

PDF

226.0 KB Created: 2010-06-11 15:34:24 +08:00

MD5: 00c51d0b2f73e52bde2bb801996a3449 SHA-1: 62ec6f10f5d207c29383f9636eb50a6386983118 SHA-256: c5ddcb56e4e4f8047a008ad82fa4e8bce080b6f772036167e064686b47e7aaaa

540 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains multiple critical heuristic firings indicating exploit activity, specifically targeting Adobe Flash Player via CVE-2010-1297 and CVE-2009-4324. The embedded JavaScript and RichMedia (Flash) content are designed to execute malicious code. The ClamAV detection of 'Pdf.Exploit.Agent-35955' and the presence of an embedded SWF file named 'AES-PHP.swf' further support this assessment. The primary function appears to be downloading and executing a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

Heuristics 15

Adobe Flash authplay SWF exploit in PDF — CVE-2010-1297 critical CVE likely CVE_2010_1297_FLASH_RICHMEDIA

PDF combines RichMedia Flash activation, a crafted SWF with ActionScript prototype/AVM-era markers or the AES-PHP/authplay variant markers, and PDF-side shellcode heap-spray staging. This is the static delivery shape associated with CVE-2010-1297 in Adobe Reader's bundled authplay.dll.
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. (matched in decompressed 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.
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.
ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
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.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`AES-PHP.swf` `3717e671d23c561cfd9c7f930f85e60340a08899311807a62139d7a8326708f9`	pdf-embedded-file	PDF EmbeddedFile object 31 at offset 0x17FD	27313 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`javascript_obj0039_000.js` `a7b7d9f122fb4ba1a43217c39e2f32d09fdb8c8df0af8200c825cae7e0315993`	pdf-javascript-stream	PDF /JS object 39 at offset 0x889F	40884 bytes
`stream_020_off0000889f.js` `760d7e6b589c595f09e01c8fb176812bcb2095ac53f17c3aa99c0799e684fa78`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x889F	20459 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 19 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_000.js` `f11e152ae5c1334ad8b204a727a35d951bdc97a8a1e8a03ca2fa821fbbd41d24`	deobfuscated-js	generic stage recovery null-collapse from JavaScript object 39 at offset 0x889F	20452 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 19 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_001.js` `ed767d275f1ccbd6e19f2f1e28ef3e310b04ad44611fcacd90b0d706e0944a69`	deobfuscated-js	generic stage recovery marker-XX-to-%u from decompressed stream at 0x889F at offset 0x889F	10290 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 19 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `cdc6b47a7652fa0a3508cca7f88b62207e4144e7d5ea81357d7203fb9feed72e`	deobfuscated-js	generic stage recovery marker-FF-to-%u from decompressed stream at 0x0 at offset 0x0	176116 bytes
`generic_stage_recovery_003.js` `c87ee5521de0f4111db9a798b7635434cd6f0008839e984d3ff0a65d36708fd1`	deobfuscated-js	generic stage recovery null-collapse -> marker-XX-to-%u from JavaScript object 39 at offset 0x889F	10281 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 19 eval/decoder/string-building token(s).
`objstm_0045_00.bin` `d8c7b61038fd49faf55e6884815ed621f8c669b068e77aeeb41693dbc7c0e321`	pdf-objstm-decoded	PDF /ObjStm 45 0 obj (inflated)	455 bytes
`polyglot_child_pdf_off0002df7f.pdf` `73b5c2297d54ff4e7fe340e2f94c9cad65ef470766eea082d937c8597a7e0e7f`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x2DF7F	43181 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: unlikely

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