PDF malware analysis — malicious · c1da0fa7bf89e88e

MALICIOUS

PDF

11.9 KB

MD5: e17ea7a662d22df4a408bbd32ae869bd SHA-1: 2a2cbea4225d53598fe4a9f94b3625fd20f6e403 SHA-256: c1da0fa7bf89e88ef0c62f7a8098677f6f7aa1ce4284291e03ff0d7267fb7eeb

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF document contains a critical heuristic firing for CVE-2007-5659, specifically using the 'collab.collectEmailInfo' method to launch a JavaScript stager. This stager is heavily obfuscated but ultimately decodes and executes a secondary payload. The presence of multiple deobfuscated JavaScript files indicates a multi-stage attack designed to deliver a malicious payload. The ClamAV detection further confirms the malicious nature of the file.

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` `9f82d46bd5dccee1d8a6e50a0e22d55a88443f18ab8678431209ed760e61bbbd`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5085 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` `02df139a6937845d5585b3a1ce31219ac56b7b94444bfa1f046ca8ed444a6bc9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12081 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` `66b93bf54a91c960dcb35c4c35ecc8a6d829b48799de250a0f97d37c135b932a`	deobfuscated-js	PDF JavaScript deobfuscation pass	78305 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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