PDF malware analysis — malicious · fef5c16b23791e3d

MALICIOUS

PDF

22.6 KB

MD5: 9a4b3e64ff15d9421e6891c4ef0051d2 SHA-1: 97e1843aa7b9ac628ce4f2f1f09ce28f5c16b505 SHA-256: fef5c16b23791e3da2419e3413c696ba52d7245ab717e827d01f684f699e9c32

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

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, indicating obfuscation to hide malicious code. The primary intent appears to be the execution of a second-stage payload, leveraging the identified PDF vulnerability.

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` `472e054f27e7f2ff9a655baeb708c88a37ad3c7ebd0ac7c521ba1426eb4ac3bb`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3530 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` `0546b80facd51b48a88228fc6315721f1fc7844b6b1aaa22a10f7138bb989972`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF8E	17546 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` `f7b6c9bb078fd8663f7325a2ef675db48915ace016ddd6388faafe8a92c6b1f0`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x544E	1518 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` `06a8cc830eba7cbe68f5212939e541399e9583ddf2de846cea7dc221e9120c66`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xF8E	1474 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` `66201566cb7b94b96d78c07e61c80e11578b5125ea85cc864e3cc788698af3dd`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x544E	79 bytes
`legacy_pdfkit_stage_002.js` `5a96a34ee8190ba0b2bb3aa8af8c02293b23f1b332531a063b73c5a3f8c040a9`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xF8E	1554 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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