PDF malware analysis — malicious · f44ee15554ca946f

MALICIOUS

PDF

20.9 KB

MD5: 827488d54b0b22003345a5d86cf94139 SHA-1: 96f30c0800e81009d07e8640730038819b16638e SHA-256: f44ee15554ca946fdf1632c0c93a7e23b0b98dd04f2c4f76f3d0513b9777872f

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains multiple embedded JavaScript streams, with a critical heuristic firing for CVE-2007-5659 (Collab.collectEmailInfo). The JavaScript utilizes eval() and unescape() functions, along with string concatenation, to obfuscate its true purpose. The deobfuscated scripts indicate that the primary intent is to execute further malicious code, likely a downloader for a second-stage payload. The obfuscation techniques and the specific CVE exploited suggest a common exploit kit delivery mechanism.

Heuristics 5

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `b010ee1b2bdafe2090d568c5d4010248af37bb73c8a9f3e63adcc7673c369718`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3931 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111712_001.js` `65701e5f5d8aaef484f6fe2c04d5d7ce826b88fe97020b67b278e57c2c865ef7`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x111F	15297 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111713_002.js` `2a0ebdd7ca25e90d57490d76b5e46777a0040fe9dc2dff9741ef641eb622f557`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4D16	1554 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `e1ef57e355b39268ad264cc25028a9a0e38b4699b467c94913104d44e9e6dafc`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x111F	1470 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `45f33a2b6011dbedaffbca7d7ed47c6f494a02676d7ebb603cee90d70a37c9b2`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4D16	79 bytes
`legacy_pdfkit_stage_002.js` `91691f3ccabd930d862b31957a50e8f65d4a583022cb8ffe9a2e49aa103eb51a`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x111F	1550 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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