PDF malware analysis — malicious · f5ab78bd0b1b9df6

MALICIOUS

PDF

9.9 KB

MD5: bbc26fbcbe6256588ce834086f5743d2 SHA-1: 1d91a19ab91e7225aee924742c39c94862cd9e6b SHA-256: f5ab78bd0b1b9df661f676c273e704b354ac21ed599c2f2f6889841ec035857e

306 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

Multiple critical heuristics indicate the exploitation of several CVEs (2009-4324, 2009-0927, 2007-5659, 2008-2992) within the PDF structure. These vulnerabilities are leveraged to execute embedded JavaScript. The JavaScript, particularly the deobfuscated version, appears to be designed to download and execute a secondary payload, as suggested by the presence of eval() calls and string concatenation for constructing potentially malicious code. The extracted file names like 'info_hex_offset_stage_000.js' further support a multi-stage attack.

Heuristics 9

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)
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.
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_obj0003_000.js` `2516a79fe80813305cc4c5f8c459a8b73edabdb5fdc221dfc60ddbf2a44d325f`	pdf-javascript-stream	PDF /JS object 3 at offset 0x2539	191 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`info_hex_offset_stage_000.js` `18a3471c4447c68bd239f028b2339950bb20e5d702c260764b36d716763455ae`	deobfuscated-js	PDF /Info subject hex-offset JavaScript (raw, offset=-96) at offset 0x14	4717 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `5868c832895dad4ec3331dd130025f35c7f37663778b88d4f50a2c6a5050cb37`	deobfuscated-js	PDF JavaScript deobfuscation pass	392 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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