PDF malware analysis — malicious · 3283b5e96b954c36

MALICIOUS

PDF

11.8 KB

MD5: f5d5a52ed87128317fe060f857d8dd9c SHA-1: 0bb4dd678c896948d1feb8d60d8577cc63b7afd8 SHA-256: 3283b5e96b954c363a04efd466b10a9eeda0eff271878da56f1f59bfb43998bd

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains multiple embedded JavaScript streams, including a large, deobfuscated one. The critical heuristic 'CVE_2007_5659: Collab.collectEmailInfo' indicates the exploitation of a known PDF vulnerability to execute this JavaScript. The JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the presence of multiple stages and the 'Agent-36063' ClamAV detection name.

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-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
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_obj0007_000.js` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `39ba5b28bcdbfaae8fb5a02988742839a9773714741e8c03596e2b3346cee86e`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4999 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `fc698ac9148482d53e44e9ce9fbb6625c0b83c17d468e5beae38a4980bc1eff5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12013 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `9f2abcb10ed0a81f965ecc4a8a9404a617c4c3ffaa0775f43f83d8839a5f72e7`	deobfuscated-js	PDF JavaScript deobfuscation pass	75760 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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