PDF malware analysis — malicious · b4116f92696408e2

MALICIOUS

PDF

12.0 KB

MD5: dc6658db551043d4f242cc07438d5a8c SHA-1: 240d7314b4e6044cd303bac5eff59ba910cd61a9 SHA-256: b4116f92696408e224857a438df4220545f3fabbe59a8cb0506788fbea5ae4f6

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated and uses a hex decoder. Critical heuristics indicate the exploitation of CVE-2007-5659 via the `collab.collectEmailInfo` method, which is a known technique for executing arbitrary code. The primary JavaScript stager, `annotation_subject_callee_hex_stage_000.js`, is responsible for decoding and executing the main payload. The presence of multiple deobfuscated JavaScript files suggests a multi-stage loading process typical of exploit kits.

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` `6c29cf43260429cd5453b3f3c5a434f00f34ee6a9ab911143f6cfd05b5c67787`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5096 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` `0995ac0b0316427264d0c6157bee2e2676bd6486a5228683814976b1ffe9b368`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12110 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` `ce441ce753fcdb6994c5303efb94b09e2f75c5dc461dff27d8166f1906970bc0`	deobfuscated-js	PDF JavaScript deobfuscation pass	73348 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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