PDF malware analysis — malicious · 2146d5f16bc89068

MALICIOUS

PDF

10.2 KB Authoring application: Tikirewnago

MD5: 86215058e29e8fdb6b1bd760e4c31ae9 SHA-1: 6ec961d3b917aef90c2a937e120380acdda31c0b SHA-256: 2146d5f16bc89068639c485c2d3e424083ca5eea59d3f9374b8af1e636fca3ea

346 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple critical heuristic firings indicating the exploitation of several CVEs (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) through XOR-decoded JavaScript. This JavaScript is embedded within PDF streams and triggered by an OpenAction, a common technique for PDF-based exploits. The script's purpose is to execute arbitrary code, likely to download and run a second-stage payload. The specific vulnerabilities targeted suggest an older exploit kit or a custom exploit leveraging known PDF reader weaknesses.

Heuristics 10

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)
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)
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0019_000.js` `4f899dfdb4fe944d165d271faa45c5bbb50f9537277414246f989ae6269343ec`	pdf-javascript-stream	PDF /JS object 19 at offset 0x23E7	48 bytes
`stream_007_off00002548.js` `79ce09d833737a39eca33a1475506f149faa44cc87367e29fa426cdef2586b5b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2548	252 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`page_word_xor_stage_000.js` `e2076b42cd7acf256dabbf38d545d297a28d0ed8b49e08cc7bb29a2fe3fb551c`	deobfuscated-js	page-word XOR decoded JavaScript (decompressed, key=0x16) at offset 0x5B5	4237 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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