PDF malware analysis — malicious · 24c0f490084daa74

MALICIOUS

PDF

12.2 KB

MD5: 601789de64dbb87135877120a2ced6bc SHA-1: 6a913d6f0b2661c811ecd6a09e3dd10b614a4152 SHA-256: 24c0f490084daa748cbdd6c1e2b8bbc44586b03ca3a5d1cfd02fdb339127d7d9

186 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 known vulnerability in Adobe Reader via the Collab.collectEmailInfo method. This vulnerability is used to execute embedded JavaScript, which is further obfuscated and then decoded. The recovered JavaScript, deobfuscated.js, is substantial and likely responsible for downloading and executing a second-stage payload. The presence of multiple JavaScript artifacts and the ClamAV detection strongly suggest malicious intent.

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 3

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` `28fd0628f197a90763f35b301e3d5a305b16c10af62745edd7d1630125f2cec1`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5284 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `d0c8953389722269b2a4bb8629f9464e589fb2716b8f43548ec91485bc7b0e63`	deobfuscated-js	PDF JavaScript deobfuscation pass	78744 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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