PDF malware analysis — malicious · 1f55a8c5c1964aa5

MALICIOUS

PDF

12.2 KB

MD5: dc366cc59fddb27372b1c0b7cb2393ca SHA-1: c49a54764e658c9619ab31b55a21db5bdaf4d833 SHA-256: 1f55a8c5c1964aa57375b78a363bc680da944fed591dc01b9fc6a44c6b0f105f

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript, specifically a hex-decoded stager found in the annotation subject. This stager is designed to be executed via the CVE-2007-5659 vulnerability, which is a known method for launching malicious scripts from PDFs. The recovered JavaScript, annotation_subject_callee_hex_stage_000.js, is the primary artifact responsible for the malicious behavior, likely downloading and executing a second-stage payload.

Heuristics 5

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)
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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `0df291d69669aabea8d48539ff6e3447b14e49a861871000e6476334f075bd19`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	1011 bytes
`annotation_subject_callee_hex_stage_000.js` `1b7a9227eded55a3e521c1f77fc6a234e645d429c24c27c1a827cd4eb6f5eef7`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5075 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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