PDF malware analysis — malicious · d83dee57f8f53e99

MALICIOUS

PDF

8.1 KB

MD5: d437affb1381569d74f4597076828a13 SHA-1: ca5050474173ff22df9844e04a7ff7bbd5dad08d SHA-256: d83dee57f8f53e99b50cbcd47bd270b5a06ee3fea9d024cde7aa6a649899b309

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF document contains embedded JavaScript, which is obfuscated and uses the unescape() function. Heuristics indicate exploitation of CVE-2007-5659 via the Collab.collectEmailInfo function. The ML classifier strongly flags this as malicious. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `60e1d2bfaf6edbd8d266ac7467b04a6ad3d499ae00fb58fd292356bf0344d4fd`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	471 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` `ef9196a4f379f14654b08c4cd25651a82e0df1685fc2f0057a7908e3183cb5d1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1B49	1832 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `91f77b5ec53dff7d128a900f18ee56f27f5c388f1c62d966b5716836c292e7ce`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x321	5082 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `6ed96d2bb298874d1b59fa6a61ef3086e1b391c2480ef7dffe0fee2b3b2247a6`	deobfuscated-js	PDF JavaScript deobfuscation pass	22089 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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