PDF malware analysis — malicious · 922e4828a795cebb

MALICIOUS

PDF

9.4 KB

MD5: 6525aa142dcaf9b77427a7f2c8714c73 SHA-1: 88ac4ba783e34079b8917c672d76e48eddc107fc SHA-256: 922e4828a795cebbcb2d0b1729d372e331288795d3518b0edc1c1a1adfedee45

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The critical heuristic CVE_2007_5659 indicates the exploitation of a vulnerability in Adobe Reader via embedded JavaScript. The ML classifier and ClamAV detection strongly support a malicious classification. The embedded JavaScript, although obfuscated, is likely responsible for downloading and executing a second-stage payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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)
ClamAV: Pdf.Exploit.Agent-35905 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35905
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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_obj0007_000.js` `d8a6b4ad1abf04d0c4a4f89535cfb57f7312edef25c443f4e844c8ec9d0929dd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	352 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `e1e889970ecbf9dfab3af68992e0df5f878d28bc60e1f26cf44cfab884a1e925`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12040 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `d337923d3fbffbca78259165dd568404e0d1e50b18adebd3e690abbc128e051b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5061 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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