PDF malware analysis — malicious · a17addcf2dfc5cb5

MALICIOUS

PDF

12.2 KB

MD5: f8a3dcf015b20845fe1bb8d79d224f7f SHA-1: 163f1870f9eb3c7a0308b5f652d7beed375777d2 SHA-256: a17addcf2dfc5cb5a7b7b1d4d951c9371463ffa653f004e9b0d1028f8bddca5a

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript that is obfuscated and staged. The critical heuristic CVE_2007_5659 indicates the use of the Collab.collectEmailInfo method to exploit a vulnerability, likely to download and execute a second-stage payload. The presence of multiple deobfuscated JavaScript files suggests complex execution flow. ClamAV also detected this as Pdf.Exploit.Agent-36063.

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` `0c54bf81d01c8480d6bbdc4d20fce3d206e4bebab066e10d8d05e8b62dd9ffc1`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5254 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` `5e48d571f21e7fc73898f43f1159aaa3fef669bed2a54ac4c595ee1f18a819e1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12296 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` `176d49c1f2a29c491a2e4973cf32841e6fde7c519c6c1d6480094e7b5d895351`	deobfuscated-js	PDF JavaScript deobfuscation pass	82462 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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