PDF malware analysis — malicious · 21f37572625983c3

MALICIOUS

PDF

11.8 KB

MD5: c99a60927312ab181f4cfb0a779cb72f SHA-1: bacb08326d5a44bec3d69bbc6a98aa1e2c7bad7d SHA-256: 21f37572625983c3515d67f0445f56923ee599b436108f7ba22e76417f73efd3

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Script Execution T1204.002 Malicious File: User Execution: Malicious PDF

The PDF file contains embedded JavaScript that is obfuscated and designed to act as a stager. Heuristics indicate the exploitation of CVE-2007-5659 using the Collab.collectEmailInfo method to execute this JavaScript. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the large size of the deobfuscated scripts and the 'stager' classification.

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` `67d8e0cc1ebeec67830b765871c73d09857a44854dd62355b171356bfe470532`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5019 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` `5169e8c4ce3bd451d90aabab80683e2835ff4aff74c4ed4aa53e80f1d90b4686`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12028 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` `090d4ec2e749cb16f2e8a8640c0275e6422489fdcac54cdd856580cebdcc31d6`	deobfuscated-js	PDF JavaScript deobfuscation pass	71803 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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