PDF malware analysis — malicious · a13a8c67b642941d

MALICIOUS

PDF

9.4 KB

MD5: 5813ca0181391b79f4881609a82103fb SHA-1: 2fd1bed05b9c22f9b3991da4734d0f771e2a1e5a SHA-256: a13a8c67b642941dbd5b7b3da844ae5612cc9f051260c472deb726b400fbde3f

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link or Host T1059.003 Windows Command Shell

The PDF sample contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). Static analysis recovered multiple JavaScript streams, indicating a multi-stage download and execution process. The primary intent appears to be the execution of a second-stage payload, as suggested by the presence of obfuscated JavaScript and extracted JS files. No specific family could be identified.

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)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `f048286b2dfe205330e162117bc9e2e9406092389e25aa91660890d79cb205b6`	pdf-javascript-stream	PDF /JS object 5 at offset 0x109	916 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `7a590a04ea87350e84c3856974289b971d37449302c9c2940b4de6ef81f0d52b`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x3C9	4919 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` `79371305d462f00f2a141b476e1cf8fba05bdb49c15d53c9a49ff740e927b262`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x3C9	11601 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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