PDF malware analysis — malicious · dd3f5c47e77f673f

MALICIOUS

PDF

11.9 KB

MD5: c5c22f432c0a86a78c649d742ecfbfb3 SHA-1: e216ccb0ea73b198330aa4d565f151dc0ba6d24f SHA-256: dd3f5c47e77f673fd0d41d1583ba35326b0fd0db404950eca1d1e426267c8ef6

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file exploits CVE-2007-5659 using a JavaScript stager embedded within an annotation subject. The heuristic 'CVE_2007_5659: Collab.collectEmailInfo' indicates the exploitation of this specific vulnerability. The embedded JavaScript, particularly the large 'deobfuscated.js' file, is responsible for executing the malicious payload. The ClamAV detection 'Pdf.Exploit.Agent-36063' further confirms 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` `f35241de395fa7daa1e4ac00af26008bb2db7a799d5af383208097bae2041a13`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5091 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` `34d30f611da0dc4f3a826b240f290f24aca13d853df3e8e099a2ea4f923f3ee7`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11933 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` `343b65ca709529aba8d9cb704c287d7d8c8f821b8180ff84a6c8dab5cbdb952b`	deobfuscated-js	PDF JavaScript deobfuscation pass	79981 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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