PDF malware analysis — malicious · 36cef52b478bc480

MALICIOUS

PDF

1.95 MB Created: 2008-09-24 19:47:56 Authoring application: Adobe (via Notepad)

MD5: 0afa5af0dacd15b0b2717f770ae8e856 SHA-1: 267dc2dac296c4145addfd67723c3b7aacf14cd3 SHA-256: 36cef52b478bc480b47d788bceab57eb8bcaee25971f536bdaaf723f6c5fbb7a

430 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

This PDF file contains multiple critical heuristic firings indicating it is an exploit kit targeting Adobe Reader. Specifically, it leverages CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 through embedded and obfuscated JavaScript. The JavaScript is further hidden by PDF encryption, requiring JavaScript execution to reveal the exploit stage. The ML classifier also strongly flagged this PDF as malicious. No specific family could be identified, but the exploit chain is clear.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 11

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT

One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
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.
Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS

PDF declares /Encrypt and also references an executable trigger (/JavaScript). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
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.

Extracted artifacts 14

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `bcd295e065c9d4e0c785cfa4d2d4112eb1450983b7671955a210a07777b43ec6`	pdf-javascript-stream	PDF /JS object 6 at offset 0xC72A	141 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`stream_024_off00015194.bin` `5774aaaeede8b93fcc4bd405929c26bceb2881775b5e1227f7e1ee589cb2fce7`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x15194	28892 bytes
`stream_051_off00057e83.bin` `38ad9bcedc4b7ecf2c917d9b8a47587436534223b90268c77b975ba5392ce469`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x57E83	11284 bytes
`stream_110_off000b23e4.bin` `cf823ce74d6aa731861cddfc0f703755115db5a9ceac6ea1460f85a65ef31a51`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xB23E4	109134 bytes
`stream_111_off000bf9ef.bin` `f6e53fd3bc01b3dc96b5ecb9e398b5a67010081166e5d7fd9ae75bde58e82472`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xBF9EF	109134 bytes
`stream_114_off000d9936.bin` `04f7f5c72888d1e44531a3587cc11258dce9989d4dd0f41e594de721ddaa6bf4`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xD9936	109134 bytes
`stream_118_off000fd13b.bin` `896ae8cd1119f88dadad8e235dae22e93fba021e3dcc669932d238e0efcbc6e7`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xFD13B	79846 bytes
`info_trailer_percent_stage_000.js` `50bbea8376f3697dd6ff872e9991c4b74c371c0d357313b36fa75314bddc655f`	deobfuscated-js	Info /Trailer percent-placeholder decoded JavaScript (object 5, info object 9) at offset 0xB4EA	2710 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`font_00_cff_off00009186.bin` `d99a27f730bfb30e46addde2d1c5010f6fd1baf2415f5d19e27b81e0f3dd2912`	pdf-font-stream	PDF embedded font (cff) at offset 0x9186	6638 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.42, consistent with packed or encrypted content.
`font_01_cff_off0000a7e9.bin` `d2fee10ff029cd37a63c094c45b3f6e15e5aa26429a3ebbb785d111598650658`	pdf-font-stream	PDF embedded font (cff) at offset 0xA7E9	3888 bytes
`font_02_sfnt_off0001ee72.bin` `f0e600ffb4e0b3f11c8ebb5dfc1969112b4e5f0be63299b24bd7ca296257470c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1EE72	24768 bytes
`polyglot_child_pdf_off00002b10.pdf` `48680ba6b73a5d720cbdc04abd4138c3e2444508db32c7f3f0bf48ea4baee277`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x2B10	2036976 bytes
`polyglot_child_pdf_off0000b3b4.pdf` `1c017a572f37ea4456fefad96b6526177b00a02ffe27e8c1cb2cb13310e0ac2d`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0xB3B4	2001996 bytes
`polyglot_child_pdf_off0000c9f7.pdf` `cca07bdf8bfd0cf08365a4c16add80edfb7706d532d190f2d54e317e8d6e32bd`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0xC9F7	1996297 bytes

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