PDF malware analysis — malicious · fcddd17ca8c3ec21

MALICIOUS

PDF

11.8 KB

MD5: c62dfc3409b724b4bd70221238b46d08 SHA-1: fdd5095174737304d5dff68de20d9e1915fbf571 SHA-256: fcddd17ca8c3ec211305876737f39eb2c6b9dfc2509cfe3536d0d0cfe353b7db

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. A critical heuristic, CVE_2007_5659, indicates the exploitation of a vulnerability related to the `Collab.collectEmailInfo` function, commonly used for launching JavaScript payloads. The extracted JavaScript, particularly the `annotation_subject_callee_hex_stage_000.js` and `legacy_pdfkit_stage_001.js` files, suggests a stager mechanism designed to download and execute further malicious content. ClamAV also detected this file as `Pdf.Exploit.Agent-36063`, reinforcing its malicious nature.

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` `83feff4894b15761e2ebeeec3e4a3efb5a0e20cfb3f40ea2573f9362968ae249`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4996 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` `19bb94d38ba1d9b2c9df1d41a6a2ea27a9c31c664cb5b74994150efe0ab64b4f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11840 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` `69c635421a6333497b3f23a1dae42bd1be9c527dcb6c5a1e60dbce613a8a8451`	deobfuscated-js	PDF JavaScript deobfuscation pass	70037 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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