PDF malware analysis — malicious · 812a599edc5d4cc6

MALICIOUS

PDF

12.2 KB

MD5: f4c1af596856c074e936a4c7de809957 SHA-1: 9131409e1248f4441e7304fc2c7de6882011c644 SHA-256: 812a599edc5d4cc6a885b7fc3b1acd88dac8a4d0f386a94b3889ff3d9b7a36fd

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

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` function, a known method for launching arbitrary code execution within PDF documents. The primary function of the embedded script is to decode and execute further stages, likely leading to the download and execution of a secondary payload. The ClamAV detection of 'Pdf.Exploit.Agent-36063' further supports the malicious nature of this file.

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` `037933ffa9dd1efb1d54dee89c46e6ab31add80feddc6d08590479e1297ec9c1`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5194 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` `71e156e6d610b4c5c6498ffc93cf19290da4408633ff69798874277f6c1b7cbb`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12372 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` `da57f89ca8b1fe383ffde916e2f7668ebb17581e764554e956248038358c3054`	deobfuscated-js	PDF JavaScript deobfuscation pass	87942 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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