PDF malware analysis — malicious · e42970d845fd914e

MALICIOUS

PDF

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

MD5: e9775ca1e08168fab595f9c18e1612de SHA-1: 67f39d9db140ecf9a8bdf60a652ed0dd6bab2d91 SHA-256: e42970d845fd914eca35a00b44c69658895bb6447047dc2dfd2af547f100a38e

380 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file exploits CVE-2009-4324, a vulnerability in Adobe Reader related to media.newPlayer. The exploit is triggered by embedded JavaScript, which is further obfuscated and recovered from a JavaScript stream. The primary function of the embedded JavaScript appears to be downloading and executing a secondary payload, as indicated by the generic stage recovery findings and the presence of an embedded SWF file named 'AES-PHP.swf'. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 12

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.
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)
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 8

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
`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` `9dcba563ce31f31b7a2c4f9cb5beeab3eacf5fa32ae8f0fbf4dc3843a5745bd8`	deobfuscated-js	generic stage recovery marker-cccccccc-to-%u from decompressed stream at 0x0 at offset 0x0	261760 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).
`generic_stage_recovery_002.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).
`generic_stage_recovery_003.js` `1af6d5f80064c29a158e9be806718cef5163d2213f059d7ed8c254d09f123da0`	deobfuscated-js	generic stage recovery percent-decode -> marker-cccccccc-to-%u from decompressed stream at 0x0 at offset 0x0	217108 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).
`objstm_0045_00.bin` `d8c7b61038fd49faf55e6884815ed621f8c669b068e77aeeb41693dbc7c0e321`	pdf-objstm-decoded	PDF /ObjStm 45 0 obj (inflated)	455 bytes
`polyglot_child_pdf_off00086734.pdf` `73b5c2297d54ff4e7fe340e2f94c9cad65ef470766eea082d937c8597a7e0e7f`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x86734	43181 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: unlikely

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