PDF malware analysis — malicious · 53c58d38c007cd30

MALICIOUS

PDF

19.9 KB

MD5: fdd5356b3f59d48da3d211a166604887 SHA-1: 20196597d36b6147f58ee7e3bd5be3b5a71b706f SHA-256: 53c58d38c007cd300b286235a79c6a6d88b43760eaee455edfff1e60e84388a2

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript that utilizes the 'eval()' function and 'unescape()' to obfuscate malicious code. The 'CVE_2007_5659' heuristic specifically identifies the use of the 'Collab.collectEmailInfo' method, a known exploit vector for this CVE. The deobfuscated JavaScript streams indicate the script's intent is to download and execute a secondary payload, leveraging the identified CVE. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `24ccce5fa96e9269f5c7f36ad6f9833f8ae542acd38ccd6e6e1084cb68bc575d`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2987 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).
`javascript_obj111712_001.js` `ddc5602a9ec8d3c4361a70fd44ef8226ef1fd0c173a8f01de01378fc6696f69e`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xD6F	15188 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111713_002.js` `954664d81ed5b8ab3dccc3e1bb7b37c13de3078a4f73746655f95da6af98b59a`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x48F9	1607 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `0a413bda37a725a77e44117aefca47f1b9687f27d73f8df3ffad227458253866`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xD6F	1481 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` `9298b942c26363f59331b8307bb0064915ffd4857c5067c126953daca3ab7d48`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x48F9	96 bytes
`legacy_pdfkit_stage_002.js` `01edb7d9fe99c48c82532e9f843de6f6e37b570770996383b2065ef5f6ec871f`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xD6F	1578 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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