PDF malware analysis — malicious · 9d5051daa43e5f0d

MALICIOUS

PDF

8.4 KB

MD5: cad4dcd9c7bc35bc603c4050f064c5bd SHA-1: a249bacb431133ad1328227362069fb20da8ce44 SHA-256: 9d5051daa43e5f0dfce179535cefa94947f51aa1b257dc52766207ca78344381

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript, flagged by multiple heuristics including a critical CVE-2007-5659 trigger related to Collab.collectEmailInfo. The embedded JavaScript, particularly the deobfuscated 'legacy_pdfkit_stage_000.js', appears to be designed to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is a malicious dropper.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `ed0b6d2b566f91973602001ab8b8407c4429e988e923c9d8e541a05f3f05b988`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	33 bytes
`javascript_obj0013_001.js` `9bf84cb715ee31e2dd0970c2ccb45132e607d032cc29fdd216f6c0c9c1edc832`	pdf-javascript-stream	PDF /JS object 13 at offset 0x359	16090 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `ba759ff9a0fdb798eeb0d8a4c26d59656dc6fab084bcec95ac5b97da057eef30`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x359	2043 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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