PDF malware analysis — malicious · b5f30db26d1f9c1a

MALICIOUS

PDF

12.2 KB

MD5: f603cd0798482be5f4135647f028f995 SHA-1: cab8aea9feee0cf3f856763c13232f9a85f885d3 SHA-256: b5f30db26d1f9c1a209776390e0a2514c4fe9ae4208d2d92c2a4fbeab170a7e5

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated and designed to act as a stager. Heuristics indicate the exploitation of CVE-2007-5659 via the Collab.collectEmailInfo method, which is a known technique for launching malicious scripts. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the 'hex stager' and 'deobfuscated.js' artifacts. The overall goal is to deliver and run further malicious code.

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` `e5d2f6379a25d8e14da197e29b2cf0e2b8ed2d78f55a67ea7f269aaf205219a4`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5182 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` `485269a849b2ae34ffd0cf3e00f0525118cb39aacb5a30b205fbb4cb00d48903`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12293 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` `a55b18bf7a44160cf7a0b9639d42b290e3bc2cd76e925ea22d736211120ec43c`	deobfuscated-js	PDF JavaScript deobfuscation pass	78426 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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